Softwood continues to be the most popular external cladding for most buildings. Western Timber Research and Development Association (). Species all the species are durable and suitable for external use for a minimum 25 years. Imported western red cedar – very good for cladding, light, pliable. Page 1. Cladding Installation details including;. Head, Cill and Jamb. TRADA Drawings supplied by.

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Timber cladding is very much in vogue. Designed well, it can produce a beautiful, long-lasting, low maintenance rain screen. However, when mistakes are made in the design it is usually very visible.

Using our FAQs, simple guides and cladding detailing trdaa below, let us help you get the design right first time. Stainless steel or non-ferrous fasteners are preferred to prevent long term corrosion and possible chemical reaction with some timber species.

Softwoods can generally be fixed with suitably sized ring-shank nails, but TRADA recommends hardwoods are fixed with screws and washers through oversized holes where double fixings are used. There are options for discreet fixing, but this is an area where specific advice should be sought from an expert source. Some species commonly used as uncoated cladding claddkng prone to extractive staining.

As the boards weather, they can leach out extractives that can stain other boards, or the surfaces of other materials below or adjacent to them. Measures that can be taken include careful building design including water-shedding details to direct rainfall away from the cladding and protecting absorbent surfaces around the cladding from the runoff during the initial weathering process.

Horizontal boards cannot be easily bent around tight radial curves, particularly if they have a tongued and grooved profile. It is therefore preferable to use vertical boards, with horizontal battens that curve.


This curvature can be achieved, for example, by building the battens up in layers thin enough to be bent cold, before extrrnal them into position by gluing and screwing. Cladding on a curved surface clafding be designed to mitigate water runoff collecting in cavities and capillary action causing high moisture content at joints.

There are Building Regulations in place which are intended to restrict the spread of fire. Depending on its location, wood cladding may require pre-treatment with a fire retardant, which must be compatible with any preservative treatments and coatings.

Timber cladding may not be acceptable close to boundaries or above a certain height. It is recommended that you check with the Local Authority Building Control. Other staining may be due to excessive wetting, claddong staining, or pollution. There are a number of ways of removing stains, from washing to the application of chemical cleaners. Further information on discoloration of cladding and maintenance options is available in our research area.

There are many different profiles, but TRADA recommends that boards should be mm maximum width, to limit the effects of any moisture movement across the board. Tongued and grooved boards should be further limited, preferably to mm max mmwith only kiln-dried wood used.

Board thickness is dependent upon the profile. TRADA also recommends that any individual part of the board, for example the tongue or top edge of a featheredge board, should not be less than 9mm in thickness. Softwood is tradq most common externl for cladding in the UK, with home-grown species increasingly selected.

External timber cladding

A variety of hardwoods and modified woods are also suitable however. When selecting species, consider the natural durability of the wood and the options for preservation and coating. Durable species may be more expensive to specify at the outset but may require less maintenance than a cheaper, less durable species.

Appearance usually in respect of the size and frequency of knots is also an important consideration and will determine which species to choose. You can also use our Technical Helpline for free at any time during office hours. Please note that advice is limited to 30 mins per call.


Commercial consultancy by BM TRADA can also be provided where written or professional opinion is required on specific products or projects. Stanbrook Abbey was described in the RIBA National Awards citation as ‘A truly extraordinary piece of architecture… To execute such a beautiful organic form suggests divine intervention.

In the summer of the idyllic shoreline of Lymington-Keyhaven Nature Reserve was home to a pair of lightweight timber cabins, known collectively as The Observatory. Dashboard Account Details Log out.

Call our technical helpline for independent expert advice Home Membership Wood Information Publications. Eurocodes Span Tables Wood Species. Case Studies Research Learning Resources. Books Online Videos Design Tools.

Learn more about cladding | Start here with TRADA

What type of fasteners should I use with timber cladding? How can I prevent my cladding from leaching out extractives? I want to clad onto a curved surface, what should I consider? Does timber cladding need fire retardant treatment? How can I remove staining that has developed on timber cladding? What board sizes are recommended? What species are suitable for use in timber cladding?

Where can I get more help? Top ten tips for timber cladding Choose and use: Quick Links ; Wood Species Database. Crosslam and glulam house.

DGN 3 External timber cladding, TRADA Technology – Publication Index | NBS

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