EXTERNAL TIMBER CLADDING TRADA PDF

Battens need to be made from durable timber e. Battens are normally spaced at mm centres. For high moisture content species like green oak use mm centres. Timber cladding should provide adequate weather protection for the buildings.

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Battens need to be made from durable timber e. Battens are normally spaced at mm centres. For high moisture content species like green oak use mm centres. Timber cladding should provide adequate weather protection for the buildings. However, it must be assumed that not all wind driven rain will be deflected. As a consequence, a well ventilated, free draining cavity should always be included in the detailed design.

Whether a solid masonry or timber frame structure, TDCA recommends that this cavity shall be a minimum of 21mm wide. However, the width of cavity is generally decided by the style and width of the cladding board.

The more open the cladding style the wider the cavity required to protect against moisture penetration. On timber frame buildings, the minimum sized batten 21mm may be used so long as its position coincides with wall studs. Cladding membrane Timber frame properties: The inner wall structure should be fitted with a breather membrane.

This serves to seal the building against damp and weather penetration. As such it should be highly durable and tear resistant in accordance with Type 1 membranes in BS Where cladding is fitted to an existing building with solid walls then to prevent water penetration the wall should be given a waterproof coating or a waterproof membrane or wax treated insulation board should be fitted.

Specification sheet downloads.

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Cladding Design Detail

Tick to show imperial to metric calculators: www. We are following all government guidelines to keep our staff and customers safe. Archive : Restoring the look of discoloured and stained timber cladding TRADA, The Timber Research and Development Association, have carried out studies into the causes of external cladding discolouration and the best ways to treat it. Black discolouration was found to be caused by a yeast fungus, Aureobasidium, which grows on both new and old timber and is found to be more prevalent in areas exposed to direct sunlight. Extractive staining, also known as tannin staining or watermarking, is caused by the movement of water-soluble organic compounds in the wood that occurs due to regular changes in moisture and general conditions that the cladding is exposed to. Both the black discolouration and watermarking were found to be effectively removed by simply using a standard pressure washer, the same type you might use to clean your car. To protect the cladding after cleaning, their tests found that applying a resin-based decking protection product kept surface discolouration at bay for more than two years, whereas untreated cladding had the mould growth return within twelve months.

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External Cladding

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