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Sandwich construction
A warm roof construction where the insulation is located above the roof deck but below the weatherproof membrane.May also refer to composite panel products, known as sandwich panels where panels are built …...

Sapwood trees
Sapwood trees display no distinction as to colour and humidity between the external and internal wood. Sapwood trees include the aspen, birch, alder, maple and whitebeech.

Sarking
Sarking, also called underlay, is a waterproof sheet material installed onto a pitched roof before the tiles are fitted. Its purpose is to prevent water leaks from rain driven under the tiles by wind …...

Sawn timber
Logs are sawn into rectangular sections of timber by sawing. The way in which the log is cut affects the behaviour and the grain pattern of the resulting sections. Logs sawn ‘through and through’ produce plain sawn sections where the growth rings meet the face at an angle of less than 45 degrees. ...

Separating walls
Walls that provide separation between occupancies or areas of different use. Specific fire resistance requirements are attached to these walls.

Shear
Shear occurs on the interface of two members which are being moved in din different directions by forces outside the joint. A pin, inserted through both members to hold them together will be torn apart, …...

Shrinkage
Reduction in dimension or volume of a material, due to a reduction in moisture content.

Sill or cill
The lowest horizontal member of a stud partition. Or the lowest horizontal member of a door or window frame.

Site security
Sites must be adequately secured against access by unauthorised persons, especially children. “No entry” signs alone is not considered adequate and would not indemnify the builder in the event of an accident …...

Smoke
The main risk to life and limb does not come from the heat of the fire but, rather, from the generally rapidly propagating smoke gases. In industrial and commercial buildings, damage by aggressive smoke gases is often as bad as the ordinary fire damage and quite frequently more costly. ...

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