Page 178 - Premdor Range Guide Autumn 2018
P. 178

                Timber door general specification
 Door specification
Imperial doors: 35mm (13/8”) or 44mm (13/4”).
Metric doors: 40mm (19/16”).
Fireshield doors: 44mm (13/4”).
Internal slab construction doors have 10mm lippings to all four edges of the door.
Internal stile and rail construction doors have 12mm lippings to all four edges of the door.
Internal FD30 doors have 13mm lippings to the top and bottom edge. 10mm lippings to each long edge.
If it is necessary to reduce the size of the door, for internal non fire rated doors, do not trim more than 5mm from any side / top or bottom. Fire doors can be trimmed up to 3mm from either side and 6mm from the bottom (do not trim top of door).
Door finishing
Veneers are natural products and variation will occur especially when used as a door pair.
4 panel, 2 light glazed, Wiltshire, Shaker, 1930’s Shaker, Croft solid, Croft solid glazed, Milano, Nice and Ladder doors are supplied un-finished and ready for finishing on site with paint or stain.
Apply a minimum of 3 top coats of a high quality interior door finish specially formulated to protect interior doors following the manufacturer’s recommendations and ensuring that the door is correctly primed and undercoated. Use a high quality permeable, micro porous wood door finish specially formulated for interior doors.
4 panel, 2 light glazed, Croft solid and Milano are also supplied as a fully finished option. Doors are finished with a 3 - part Polyurethane coating for lasting protection.
Special order sizes
Premdor can only offer the sizes stated in the catalogue. Bespoke orders in this range are not available.
Single doors featuring bevel edged or decorative glass should be hung selectively to ensure fully matched glazing if used as pairs. Premdor cannot guarantee matching grain or colour on timber doors when used as pairs.
Please note that Option Plus servicing is not available on timber doors. Timber doors are not available for use within SpeedSet or SoundSecure doorsets.
Door prices exclude ironmongery and frames. Except where stated, doors supplied will require on site finishing. When ordering always state product codes. All prices exclude VAT. Specifications may vary at our discretion.
Storage and handling
Doors should be stored and handled as prescribed in the BS Code of Practice BS 8000 Part 5. Doors should be laid flat on three equal thickness bearers located along the door length to evenly distribute weight and avoid damage, and kept dry and clean inside any polythene packaging until immediately before painting/ staining. Do not store or install in an area which may be subject to extremes of temperature. Use a dry, well ventilated building, in areas which have not been recently plastered. It is essential that precautions are taken to prevent moisture content build up. Particular care is needed in centrally heated or air conditioned buildings. Premdor must be informed at the time of tender and order whenever doors are needed for such buildings. The testing and rapid switching on and off of heating during the construction is detrimental to joinery.
Doors should not be exposed to sunlight since natural shading or fading might occur. It is important that any packaging material (shrink wrap etc.) is left on the door for as long as is practically possible to avoid damage to door surfaces. This is particularly relevant to fully finished products.
Doors should be fitted as prescribed in the BS Code of Practice BS 8000 Part 5.
It is essential that doors be fully sealed and any air gaps plugged, immediately after delivery.
Edges of doors with lacquer finish should be sealed and if any surface is subsequently cut,
it should be painted or lacquered before the door is fixed into position. This particularly applies when end grain is exposed. It is essential that if the preservative seal is broken in any way (e.g. trimmed, drilled or cut for letter box, hinges etc.) then any such exposed area should be sealed, painted/stained. If, when installing doors, a reduction in overall size is required, it is important that equal amounts are taken from opposite edges. Allowable trim dimensions available on request. When fitting locks and latches in doors, it is important to ensure that the construction
and performance of the door is not adversely affected. If a mortice lock is to be fitted, it must not be located opposite the mid rail of the door. Letterplates, locks etc. should be installed prior to the door being hung.
Factory finished products
Coated surfaces require regular maintenance
and cleaning at least annually to remove surface pollution. Some ‘chalking’ of the finish may occur over time due to natural erosion of the microporous paint film. This does not detract from the systems protective performance. On occasion timber products may exude resin after installation. Typically, if resin is present this ‘bleeding’ cannot be prevented. Discolouration can occur which will require attention and maintenance to retain the aesthetics and integrity of the coating. Resin exudation is excluded from our performance guarantee.
Decoration should be carried out in accordance with BS 6150 and BS 8000 Part 5. Products must be clean and dry prior to finishing, having moisture content which is no greater than the average for the intended location.
Always follow the instructions provided with the stain or paint which is to be applied.
It is important that the finishing system is balanced by equal application to both sides at the same time to ensure that an imbalance of moisture does not occur, particularly in the decoration of doors. The complete surface area should be fully treated with topcoat paint or stain prior to installation. To ensure adequate coverage at least three coats of topcoat paint/stain needs to be applied. All edges, rebates for glazing and any areas which have been cut, drilled, etc. must be fully painted/ stained to the same standard as the rest of the door.
Premdor has no control over customer applied finishes of doors and therefore cannot accept any claims for problems of any type relating to customer finishing of the doors.
We do not recommend the use of varnish as there may be adhesion problems due to the resinous nature of some hardwoods. Do not apply varnish coatings to these doors.
Do not use oil (e.g. Danish oil) waxes, polishes or dyes as they do not properly seal the door and can lead to delamination of the veneer.
Coatings must be regularly maintained to prevent a breakdown of the protective paint or stain film, which can lead to moisture ingress/loss and deterioration of the door.
Please note
Finger-jointed materials may be used in manufacture, enhancing product stability.
Environmental policy
All oak doors are environmentally third party certified PEFC.
Guaranteed for five years against manufacturing defects
Product availability
Items shown highlighted are available on a reduced lead time.
range guide: autumn 2018 | technical

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