Acid Etching
A process, manly used for glass decoration, where the glass surface is treated with hydrofluoric acid. Acid-etched glass has a distinctive, uniformly smooth and satin-like appearance.

Acoustic Insulation
The ratio of external sounds passing through a glazing surface.

Annealed Glass
During the float glass process, the hot glass is gently cooled in the “annealing lehr”, which releases any internal stresses from the glass to enable the cutting and further processing of the glass post-manufacture.

Antique glass
Term used to describe art glass produced by the mouth-blown cylinder which is first blown, then annealed and colled. The cylinder is then scored lengthwise, separated and re-heated and shaped into a flat sheet. The finished sheet is premier art glass with linear striations and a very smooth surface and often is one-of-a-kind in appearance.

Antisun Glass
Anti Sun is a body tinted glass, manufactured in the same was a clear float glass, however has a coloured appearance as well as solar control properties.

An inert, nontoxic gas used to fill insulating units, thus improving thermal performance.

Arrised Edge
A basic form of edge working, by removing the sharp edges of cut panes of glass.

Bead or Glazing Bead
A strip of wood, metal or other suitable material attached to the rebate to retain the glass.

Bent (or Slumped) Glass
Glass which has been heated in a kiln from room temperature to a temperature high enough to cause it to soften and slump (sag) into or over a mold. The finished item takes the shape of the mold.

Cold glass (usually clear, thick plate) with edges that have been ground and polished to an angle other than 90 degrees. Transmitted light is refracted and a prism-like effect results. Bevels are available in a variety of sizes, shapes and geometric configurations (called “clusters”) for incorporation into leaded glass work.

The process by which an edge of glass is finished to a bevel angle.

Broken Down Double Glazed Unit
This is a glass double glazed unit that has misted up inside due to moisture ingress. A broken down unit can not be reliably repaired and should always be replaced with a new unit.

A mouth-blown piece of glass with a circular shape. These are incorporated into art glass and leaded glass artworks. Machine-made facsimiles are common, called “pressed rondels.”

A synthetic rubber based sealant mostly used for the production of insulating glass units.

Bulletproof Glass
Glass designed and produced to resist penetration by bullets.

Body-tinted glass
Transparent float glass with a consistent colour throughout its depth.

A narrow flat bar of lead, zinc or copper, which holds together the pieces of glass in copperlight glazing or leaded lights. Cames are H-shaped in section ,the central part is called the heart or core, and the flat part that covers the glass is called the leaf or the flange. Individual calmes were soldered to each other where strips met.

A term used to describe a void filled with sealant.

Clear Glass
Mostly composed of soda, lime and silica to obtain a very clear type of glass.

When water vapour from the air comes into contact with cold surfaces, the vapour condenses on the cooler surface of the glass forming a foggy effect.

A thin layer or covering which changes the basic composition of glass.

The cavity formed by the spacer bar between the two panes of glass in double-glazed units. It is generally filled with air.

Recycled glass used in the manufacture of clear float glass.

A process in which glass is trimmed, also for decorative purposes.

Cut Outs
The glass has internal or external shapes cut out such as for sockets.

Design Heat Loss
The calculated ratio for heat which is transmitted from a warm interior to a cold exterior.

A hygroscopic substance used as a drying agent in insulating glass units.

A calculated temperature at which water vapor will condense.

An optical effect obtained on the glazing surface.

Double Glazed Units
Two panes of glass enclosing a hermetically-sealed airspace.

Drilled Glass
Holes drilled through the glass or mirror usually for fixing.

Dry Glazing
A glazing process which does not use chemical compounds, only dry, mechanical fixings.

Dual sealed system.
A primary seal of polyisobutylene and a secondary seal of polysulphide, polyurethane or silicone ensuring the effective and durable sealing of double-glazed units.

Edge clearance
The distance between the edge of the glass and rebate.

Edge Cover
The distance of the edge of the glass and sight line.

A glass finishing process of polishing edges.

A process consisting of polishing or abrading-scraping the edge of the glazing surface.

Electrochromic glass
It works by passing low-voltage electrical charges across a microscopically-thin coating on the glass surface, activating a electrochromic layer which changes colour from clear to dark.

Is the relative ability of a surface to absorb and emit energy in the form of radiation.

Face Putty
This is the sloping edge of putty from the glass to the frame.

A term used to describe the placement of a window in a structure.

Fire-resistant glass
Special type of glass designed to contains flames and inflammable gas for a longer period.

Fire-resistant glass – heat transmi
Contains flames and inflammable gas for a short period of time, but does not prevent the transmission of heat to the other side of the glazing(example: wired glass, reinforced laminated glass).

Fire-resistant glass – fire-insulat
Contains flames and inflammable gas for a longer period of time and prevents not only the transmission of flames and smoke but also of heat to the other side of glazing.

Float Glass
A term for perfectly flat, clear glass (basic product). The term “float” glass derives from the production method, introduced in the UK by Sir Alastair Pilkington in the late 1950’s, by which 90% of today’s flat glass is manufactured.

A reaction caused by glass condensation.

The basic rigid supporting structure of a window, building, etc.

Gas fill
A process in which argon or krypton or xenon is filled into the cavity of insulating glass to improve thermal performance.

Pre-formed glazing materials used for bedding or securing glass and for separating glass from the frame.

Hard, transparent, translucent, or shiny substance, made by melting a mixture of sand, soda and lime at a high temperature, followed by cooling.

Installing Glass into a frame or structure.

Glazing bead
A strip of wood, metal or other suitable material attached to the glazing surround to fix the position of glass.

Glazing Compound
Soft material used for the glazing of glass.

Glazing Tape
Butyl glazing strip for installing glass and double glazed units into timber and steel windows and doors.

Hack Out
To remove the old putty or beading or silicone on a window or door frame to reveal the rebate and install the replacement glass.

Hardcoat Low E
Hard coat glass is created by pouring melted tin on top of a sheet of glass. (see Low E Glass).

Inner pane
The pane of a double-glazed unit which faces the interior of a building.

The term applied to the material used in laminated glass to bond the glass leaves together.

Insulating glass Units
Insulating glass is a multi-glass combination consisting of two or more panes enclosing a hermetically-sealed air space.

Insulating Strip
A material used to protect the edges of the glass from rigid contact with non-resilient.

Insulating value
See U-value

Intumescent Glazing Tape
A flexible self-adhesive polymer based extruded intumescent material suitable for sealing wired or fire resistant glazing into fire doors and fire resistant partitions.

K Glass
A hard coat Low-E glass manufactured by Pilkington Glass Ltd.

The former term for U-value on the European continent.

A furnace or oven for fusing, enameling and casting glass.

A gas used in insulating glass to improve thermal performance of the unit.

Laminated glass
Laminated glass is a combination of two or more glass sheets with one or more interlayers of plastic (PVB) or resin. In case of breakage, the interlayer holds the fragments together and continues to provide resistance to the passage of persons or objects.

Leaded glass
Glass pieces joined with metal strips (lead came). Solder is applied to the joints of the came to hold the pieces together.

Low Emissivity (Low-E) Coatings
Is a microscopically-thin coating of metal oxide. This special coating allows the sun’s heat and light to pass trough the glass into the building. At the same time it blocks heat from leaving the room, reducing heat loss considerably.

Low-E glass
Low-emission glass (Low-E) is a clear glass, it has a microscopically-thin coating of metal oxide. This allows the sun’s heat and light to pass trough the glass into the building. At the same time it blocks heat from leaving the room, reducing heat loss considerably.

Low Iron Glass
Low iron glass is ultra clear and provides a higher degree of transparency than clear float glass. This optimum clarity is achieved by removing most of the iron oxide content used to produce glass. The improved clarity of low iron glass compared with clear float glass is barely discernible unless the two types of glass are viewed against a coloured background.

Marker applied to the glass to make the glass obviously visible.

Any of a wide variety of waterproof materials, not limited to sealants.

Mirrors are commonly made using glass with a smooth, polished surface that forms images through the reflection of rays and light from a silvered backing.

Mirror Silvering
A chemical process used in the manufacture of mirrors, whereby a coating of metal, mostly silver, is deposit on the surface of clear or body-tinted glass.

A vertical framing section between glass panes.

Non-insulating glass
Fire resisting glass, providing the criteria of E (integrity) only.

Obscure Glass
Any type of glass with uneven surfaces which offers light diffusion and privacy.

Outer pane
The pane of double-glazed unit which faces the exterior of a building.

A sheet of glass.

Painted Glass
Paint sprayed onto one side of sheet glass most often used for splashbacks in kitchens and bathrooms.

Patent glazing
A non-load bearing, drained and ventilated framing system, used predominantly in overhead glazing.

Patterned glass
Textured patterned Glass is made by rolling an embossed roller over the hot glass after it’s been poured on the table. One of the forming rolls is embossed with a texture that is imprinted on the glass as the sheet is formed. This produces glass smooth on one side and textured on the other.

A metal tool to hold glass in a frame.

A soft coat Low-E glass manufactured by St Gobain Glass Ltd.

Plate Glass
Used in the past to produce higher quality glass, this technology was completely outperformed by the float glass process.

Photovoltaic glass
A special glass with integrated solar cells, used to convert solar energy into electricity.

Polished Glass
The edges or the glass have been arrised and polished to give a smooth surface.

Primary seal
A butyl-based sealant applied to the edges of the space bar during assembly into double-glazed units, to ensure a watertight and airtight seal around the perimeter of the unit.

Processed Glass
Any type of glass that has been worked on eg, polished, drilled, painted.

The plastic interlayer incorporated into laminated glass in order to ensure good adhesion and the mechanical and safety breakage characteristic of the glass.

The trimming of a first compound application used to seal glass, so as to facilitate the addition of a second sealant.

The section of the frame surround which forms an angle into which the glass is placed and held.

Resin laminate
Two or more sheets of glass assembled with one or more resin interlayers.

Restoration Glass
Historic glass has character due to its undulations and bubbles from its handmade process which modern glass lacks. There are a small number of glass manufacturers and suppliers of this traditional glass, which can, depending on its suitability, even be incorporated in double glazing.

A mouth-blown piece of glass with a circular shape. These are incorporated into art glass and leaded glass artworks. Machine-made facsimiles are common, called “pressed rondels.”

Safety Glass
Glass which must have passed an impact test and either must not break or must break safely.

Sand-blasted glass
This type of glass is produced by spraying sand at high velocities over the surface of the glass.

Screen printed glass
Screen printed glass is tempered or heat-strengthened glass, one face of which is covered, either partially or totally, with mineral pigments.

A flexible material for sealing.

Sealed Double Glazed Unit
A combination consisting of two glass panes enclosing a hermetically-sealed air space.

Sealed Multiple Glazing Unit
A combination consisting of several glass panes enclosing a hermetically-sealed air spaces.

A substance applied to glass and frame surfaces that guarantees consistent adhesion.

Secondary seal
A sealant applied to the edges of double-glazed units after the primary seal, to provide effective and durable adhesion between the glass components and spacer bar.

Seedy Glass
Glass in which air bubbles are entrapped and visible.

Self cleaning glass
A special nano-scale – extremely thin – coating of microcrystalline titanium oxide which reacts to daylight. This reaction breaks down filth on the glass, with no need for detergent. When it rains, a hydrophilic effect is created, so water and dirt slide off.

Sheet Glass
A lite of glass.

Sight size
The actual size of the opening that admits daylight.

A polymeric organic compound offering excellent resistance to cold, heat and water.

Single glazing
Window or door with a single glass lite.

Snow load
An imposed load exerted onto a structure by formation of snow.

Softcoat Low E
Soft coat glass uses silver, zinc or tin, and the metal is applied to the glass in a vacuum. When choosing between the two different types of Low E Glass, soft coat windows will actually provide you with better results. Soft coat low-e windows have a higher R-value, which means that they insulate better than hard coat low-e windows.

Solar control coatings
A microscopically-thin coating that absorbs or reflects solar energy.

Solar Heat Gain
The amount of heat that a structure gains through the glazing surface.

Spacer bar
A spacing bar along all edges of a double-glazed unit, filled with desiccant, which separates the two panes of glass and creates a cavity.

Small fragments of glass that are ejected from the surface of a laminated glass sheet when the opposite surface is impacted.

Stained Glass
Coloured flat glass or any object made of such glass joined by lead came or copper foil.  Once the medieval term for painted glass, it is now used as a general term to define the art, the craft, and the industry.

Surface Coatings
A thin layer or covering which changes the basic composition of glass.

Tempered glass
Tempered (toughened) glass is two or more times stronger than annealed glass. When broken, it shatters into many small fragments, thus preventing major injuries.

Textured Glass
Textured Glass is made by rolling an embossed roller over the hot glass after it’s been poured on the table. One of the forming rolls is embossed with a texture that is imprinted on the glass as the sheet is formed. This produces glass smooth on one side and textured on the other.

Thermal break
A type of metal frame that incorporates an insulating material of low thermal conductivity located between the inner and outer parts of the frame in order to reduce the rate of heat loss.

Thermal expansion
Change of material size as a result of temperature change.

Thermally insulting glazing
Double-glazed units provide thermal insulation.

Thermal mass
A special mass in a structure which is used to absorb solar heat during the day and then release the heat in the evening.

Thermal shock
When glass is exposed to high temperatures, it absorbs heat and expands. At the same time, its edges remain cooler, causing thermal stress.

Tight size
The actual size of an opening into which glass is to be glazed and is measured from the rebate platform.

Tinted/ pigmented interlayer
A coloured plastic or resin sheet between two or more panes of glass.

Toughened Glass
Toughened glass is two or more times stronger than annealed glass. When broken, it shatters into many small fragments which prevent major injuries.

Traditional Leaded Lights
Traditional leaded-lights (also known as stained glass) are made by incorporating different types and textures of glass, the individual pieces of glass are joined together with H section lead came, all the joints are then soldered together to form the leaded-light, The leaded light is then cemented to make it weatherproof, they also may be encapsulated inside double glazed units.

Allowing light to pass through diffusely.

Clear, permitting vision.

Triple glazing
Three panes of glass enclosing two hermetically-sealed air spaces.

This is a measure of the rate of heat loss of a building component. It is expressed as watts per square metre, per degre Kelvin, W/m2K.

A piece of material used on windows or doors to reduce leaks and prevent rain and wind from entering the structure.

Hermetically-sealed to prevent entry of water and air into the structure.

Warm edge spacer bar
Insulating spacers used to seal Insulating glass. Since they do not contain aluminium, they are less conductive, thereby improving the U-value of the window, and reducing condensation.

Wired glass
A product in which a wire mesh has been inserted during production. It has an impact resistance similar to that of normal glass, but in case of breakage, the mesh retains the pieces of glass.

Air infiltration
Industry test that measures the amount of air leakage through a window or door (the lower the number the better).

Decorative trim positioned directly underneath a window stool and installed flush against the wall.

Arch window
4 sided unit with a curve at the top.

The center member of a double door, which is attached to the fixed or inactive door panel.

Astragal Window Bars
Grille intended to replicate the look of a True Divided Light unit; consists of an interior grille, exterior grille and spacer between the glass panes.

Counter-weight mechanism to assist raising or lowering of a double-hung or single hung sash.

Bay window
Window consisting of three or more units that angle out beyond the wall; often configured with a large center unit and two flanking units.

Bi-Folding door
Door unit with multiple hinging panels that can be folded together to create an large, unobstructed opening.

Bow window
Window consisting of three or more units projecting out from wall to form a radius.

Casement window
The term used to describe a conventional window, with a sash that is side or top hinged. Casement windows open outwards.

Check rail
Located on double-hung windows where the bottom sash and top sash meet and the lock/keeper is mounted.

Low maintenance covering or coating attached to the unit exterior.

Clear opening
The size of the opening created when a unit is in a full open position.

Composite Door
Robust, secure style of door that looks and feels like a traditional timber door. It’s made from an outer skin of GRP (Glass Reinforced Plastic) over a wooden frame infilled with foam insulation.

An ornamental molding at the top of the window positioned above the exterior trim.

Cottage window
Double-hung window where the upper sash is shorter than the bottom sash.

Door Frame
A group of components (wood, aluminium or steel) that are assembled to form an enclosure and support for a door. Also known as door jambs.

A space which protrudes from the roof of a house, usually including one or more windows.

Venting upper and lower sash in a single frame that slide vertically past one another.

Dowel joint
A corner joint created by precisely boring matching holes into a door rail and style and joining them together with a dowel pin.

Drip cap
One piece aluminum or vinyl cover installed above windows/doors that directs water away from the top of the unit.

Egress window
A venting window required by building codes for emergency escape and rescue, which are typically required in bedrooms and which are required to meet certain minimum opening dimensions.

Equal site lines
This is when both open and non opening parts of a window both look the same.

Equal lite
Window or door with equal spaced grille bars.

Escutcheon plate
Decorative door handle plate that conceals the locking mechanism.

Extension jamb
Wood component fastened to the interior of the window/door that extends the window frame out to the wall depth.

Exterior trim
A decorative trim positioned around the exterior perimeter of a window or door.

Extruded aluminum
Aluminum that is shaped by running it through a dye, typically more durable than roll-formed material.

Refers to an opening in a structure such as windows, doors and skylights. Can also refer to the placement of windows and doors in a building.

Fenestration Self-Assessment Scheme. FENSA was set up by the Glass and Glazing Federation (GGF) to allow registered companies to self-certify that their installations comply with current Building Regulations.

Fixed window
Non-venting or non-operable window. Also known as picture window.

A thin strip of metal or synthetic material that diverts water away from a window or skylight.

Non-venting or non-operable.

Folding door
Door unit with multiple hinging panels that can be folded together to create an large, unobstructed opening.

Foot lock
Auxiliary lock used on gliding doors to secure the operating panel to the sill.

Outer structure of a window or door that holds the sash or panel in position.

French casement window
Unit with two venting sash that open outward to provide a large center opening with no center post.

French door
Hinged door(s) with large glass area surrounded by a wide wood side stiles and a tall bottom rail.

Full frame
Frame intended for installation direct to the rough opening; opposite of insert window.

Georgian Bar
uPVC or timber bars that divide a window into sections e.g. A Georgian style window.

Georgian Grille
Grille bars that are placed between the glass panes; allows for easy cleaning.

Glazing Bars
uPVC or timber bars that divide a window into sections e.g. A Georgian window.

Glass in a window sash or door panel; the act of installing glass in a window sash or door panel.

Glazing bead
Wood or vinyl pieces around the perimeter of the glass that covers the space between the glass edge and sash/panel.

Gliding door/sliding door
Door with two or more panels where one panel slides horizontally past another.

Gliding window/sliding window
Window with two sash, where one sash slides horizontally past the other.

Gusset plate
Metal plate attached to a window or door to strengthen a window or door joint.

Opening direction of hinging windows and doors; direction is determined by location of hinge on unit as viewed from exterior.

Inactive panel/sash
Panel/sash that will open only after active panel/sash is opened.

Window or door frame members that form the top and sides of a unit.

Receiver on a sash that the lock engages.

Heavy beam extended across the top of the rough opening to prevent the weight of the wall or roof from resting on the window frame.

Mechanism used to secure windows and doors into a closed position.

Making Good
To tidy up the the installation of windows and doors by plastering, rendering or silicone to finish the job neatly.

Masonry opening
Opening in a brick, stone or stucco wall where a window or door is installed.

Meeting stile
Central location on a gliding window or door where the sash/panel overlap.

Strong wood joint made by fitting together a slot (mortise) in one board and the matching projecting member (tenon) on the adjoining board.

Mortise Lock
High security lock used on doors.

Joining of two or more window or door units together; joint can run vertically, horizontally or both.

The vertical or horizontal joint between individual window or door units that form a combination.

Multi-point lock
Lock that engages the sash or panel in multiple locations; activated by a single motion.

National Fenestration Rating Council is an non-profit organization that provides for fair, accurate and credible energy performance ratings for windows, doors & skylights.

Night Vent / Trickle vent
Ventilation grills to allow air flow on windows and doors.

Palladian window
Large, arch-top window flanked by smaller windows on each side.

Refers to the rail, stile and glass assembly on a door; similar to a window sash.

Patio Door
A sliding glass panel door usually onto a patio or terrace, they can slide one way or open centrally sliding in both directions.

Factory painted or stained unit that is ready for installation; no finish coat required.

A Length or window or door frame material.

Horizontal components of a window sash or door panel framework.

A covering over the house exterior usually in cement.

Rough opening
Opening in a wall for the installation of a window or door.  The rough opening is larger than the actual unit to allow for shimming and insulating.

Rail, stile and glass components joined together the form the venting capability of a window.

Sash glazed /Sash set
Fixed window with a separate sash and frame intended to replicate the look of nearby venting windows.

Secondary Double Glazing
An internal frame and glass that sits inside the original windows.

A form of high-security locking system.

Tall, narrow unit placed alongside a window or door.

Sill / Cill
Horizontal member that forms the bottom of a window or door frame.

Double-hung styled window in which the top sash is inoperable.

The underside of an exterior overhanging roof eave.

Handle internal mechanism.

The vertical components of a window sash or door panel.

An accurately detailed inspection and measure up of the site and work to be carried out.

Decorative wood component used as a transition door sill to the interior flooring.

Tilt and Turn Windows
Windows that may be opened to lean into the room and also opened by a hinge to the side into the room. All done by the turn of the handle.

Toeing and healing
The proceedure to correctly hang and fit a door for smooth accurate operation.

Window positioned directly above another window/door.

This is a measure of the rate of heat loss of a building component. It is expressed as watts per square metre, per degree Kelvin, W/m2K.

Vertical Slider Window
A window with two overlapping sliding frames.

Walk in Bay
A full length Bay window to walk through.

Compressible material designed to seal the sash or panel to the frame.

Woodgrain Windows and Doors
A foil wrapped PVCU or Aluminium window or door frame to give the appearance of a wood effect.

Conservatory Facets
The sides to the front of a conservatory.

Air conditioning
A system which can generate both temperature controlled cold and warm air via a fan.

Base wall
A cavity brickwork wall onto which the conservatory will sit between 300 mm to 750 mm high.

Boundary line
This is normally the dividing line between properties normally the fence or another physical barrier.

Building regulations
Written permission from a local authority permitting construction of a house, extension or conservatory.

Combination conservatory
Normally a conservatory that possesses two or more conservatory styles within it e.g. 3 facets and sun lounge.

A decorative upright moulding on the top of a conservatory which also helps to stop the birds from sitting on the roof.

Damp proof course normally laid 150 mm above ground level.

Damp proof membrane this is laid between the sand blinding of the hardcore and the oversite concrete to prevent damp from rising up through the floor.

Dental moulding
A decorative moulding normally below the guttering of the conservatory.

Dwarf wall
A cavity brickwork wall onto which the conservatory will sit between 300 mm to 750 mm high.

Edwardian Style
Usually a square or rectangular conservatory design with an apex roof structure.

Eves beam
The beam above the window frames of the conservatory which supports the roof.

External Cill
A special moulded section at the bottom of a window or door that allows the rainwater to run off and not run down the brickwork of the base wall making it damp.

The pointed part of the cresting.

Flank wall
Normally a side wall of a conservatory built on or near a boundary.

Normally a lead covering between the roof of a conservatory and the brickwork of the house onto which it is fixed which prevents rainwater from penetrating down the back of the conservatory.

The brickwork from the top of the foundation to the D.P.C. of the conservatory.

The concrete strip cast into the ground onto which the footings the conservatory are built.

Structural window frames manufactured to accept the weight of the conservatory roof.

Gable conservatory
A conservatory that has a gable front (like the end of some houses that forms a point).

Garden Room
A conservatory that has a roof that slopes from the rear to the front.

A device to collect rainwater from the roof of the conservatory.

A group of woods that are particularly suited to the construction of conservatories.

Inspection Chamber
Usually, a chamber which contains underground sewage pipes or services.

Internal cill
A window board or tiling that covers the cavity at the top of a dwarf wall.

Lean-to Conservatory
A style of conservatory. Also known as Sunlounge or Mediterranean. Lean-to conservatories are quick and easy to install and can be a practical and less expensive solution. Lean-to roofs slop down from the rear to the front.

Usually, a chamber which contains underground sewage pipes or services.

The material used to bond bricks together when building a brick wall.

Orangeries use less glass than modern conservatory styles and are generally buildings with glazed sides and brick supports. The roof area is of a lantern style.

The construction of the concrete floor to the conservatory.

PolyVinal Chloride Un-Plasticised

P-Shape Conservatory
A combination of a Victorian or Edwardian style with a lean-to to form a P shape conservatory.

Planning permission
Written permission from a local authority permitting development of a house, extension or conservatory.

A smooth finish which is laid onto a brick or block wall which can be decorated.

A plastic roof covering for a conservatory roof which is supplied in clear opal and bronze.

Ring beam
The beam above the window frames of the conservatory supports the roof.

Roof Ventilator
An opening window in the roof of a conservatory to allow ventilation.

A smooth light sharp sand and cement finish is laid onto the oversite when all the major building works have been completed onto which you can lay floor tiles or carpet etc.

Sealed manhole cover
A special metal double sealed cover with 4 screws fixed to the top of the chamber level with the floor finish preventing gas from the chamber entering the conservatory or any other room.

Skirting boards
Timber moulded boards are fitted at the bottom of walls and then decorated.

Solar Coating
Technical Glass used in the makeup of double glazed units is usually used on the roof of a conservatory to reduce the heat by reflecting the sun away from the roof.

Sun lounge
A conservatory that has a roof that slopes from the rear to the front.

Tie Bar
A metal rod or timber member to prevent the conservatory from spreading (Lateral movement the sides of the conservatory moving away from each other).

Top fanlight
The top part of a window above the transom bar.

Top hung sash
An opening window either hung below a transom bar or a full length opening window not to be confused with a fanlight which is a small opening window.

Unequal site lines
This is when the opening part of a window stands proud of the non opening parts of the window.

Victorian Conservatory
Usually a 3 or 5 polygonal faceted conservatory with an apex roof structure

Wall ties
Metal restraint wires approximately 3 mm thick which link the two cavity walls together to give it strength and assist in weathering.