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Where necessary to protect the heads of timber features, the underlay should extend 50mm beyond gable walls, bargeboards, etc.
To reduce the risk of freezing and condensation on pipework, the following precautions should be taken: When inspecting trussed rafter roofs, be on the look out for the removal of any internal webs or any other alteration to the trusses where bolts, nails or screws have been used to fix members. Such an addition to a roof structure would generally indicate than some other member has been removed.
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CEILING JOIST or TIE: triangulates the rafters, stopping the walls and roof spreading outwards; supports the ceiling finish and any walkways, etc When the author has inspected roofs there have been some occasions when the householder has to be advised to remove or lessen the amounts of goods stored in the roof for danger of overloading it. Typically the bottom chord of a truss is designed for a superimposed load of 0.25 kN/m2 which the author often refers to as empty cardboard boxes loading. The webs are set out by considering the overall internal triangle. The intersection of the webs with the top chord will normally be at the quarter points. The intersection of the webs with the bottom chord will normally be at the third points of the internal triangle. For small span or for large span trusses, alternative internal configurations are used Connections
To prevent the underlay sagging at the eaves and forming a water trap behind the fascia, it is recommended that the underlay is supported by a continuous fillet. Where the pitch is below 30°, a continuous fillet should always be used. Plain tiles are unsuitable for pitches less than 35°. (b) verges For any further information or prices please do call our national sales office. Buy Celotex Insulation fixings for fixing Pitched roof insulation currently unavailable Careful setting out makes the actual tiling process faster and will influence the finished appearance on the roof. It helps to avoid problems such as unequal overhangs at verges and often makes it possible to avoid excessive tile cutting at abutments, chimneys and similar obstructions. If you have chosen to use a scissor truss or a raised tie roof truss, then it is recommended you use slide shoes (glide slides) instead of the framing anchors or roof truss clips. Always be on the look out for existing roofs that seem to have substantial amount or significantly heavy items stored in them. Books and paper in particular create high loadings.
Slide shoes are similar to clips and framing anchors, and are fitted to the wall plate on either end of a roof truss to restrict horizontal movement. A standard roof truss design will have the ceiling chord coming directly out the wall plate, but raised tie and scissor trusses have a higher ceiling cord, giving extra space from the wall plate, so a shoe slide is needed. Two clips are used per roof truss. One is placed on either side, where the truss is fixed to the wall plate. Usually, the roof truss clip is installed on the inside wall plate. However, you can also fit these on the outside wall plate if the detail of the truss heel allows.
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