OZCO 51717 Ironwood 2-inch Rafter Clips, (10 per Pack), Black

Product Information

Batten ends should be cut square and nails skew driven on each side of the joint. Not more than one batten in four should be joined over any one truss or rafter. Where proprietary eaves ventilators are used, they should be fixed in accordance with the manufacturer's instructions. Battens should be set out in straight lines, parallel to the ridge and to the gauge required by the tile or slate. The lap should not be decreased because this would reduce weathertightness. The lowest batten should be fixed so that the tile projects halfway across the gutter. Where roof coverings are of plain tiles or slates, laced and swept valleys may be used or, alternatively, a mitred valley with soakers.

STRUTS: give support to purlins to prevent deflection and transmit roof loading to loadbearing structure below. Restraint straps should be fixed to solid noggings with a minimum of four fixings of which one should be in the third rafter. The fixings should be four steel screws or four 75mm x 4mm (8 SWG) round nails. 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 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. Trimming members around dormers should be large enough to take the extra load from the cut main roof members and dormer framing and cladding, as detailed in the design.

Applications and Solutions

Where straps are fixed to masonry, hardened nails 4mm in diameter x 75mm long or No 12 wood screws x 50mm long into plugs should be used. 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. The pitch of a valley is less than the pitch of the main roof. Where tiles are to be used for valleys, the valley pitch should be not less than the minimum permissible pitch given in Table 1 of Appendix 7.2-B.

Proprietary gutter or valley systems should be fixed in accordance with the manufacturer's recommendations. (e) flat roof intersection 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. Provides support to purlins to prevent deflection and to transfer roof loads to the load-bearing structure below.

Celotex insulation fixings are a perfect solution when installing rigid insulation boards in between timbers. Where the flat roof is over a dormer, it is recommended that the flat roof should be designed and constructed with a fall to the front or sides. RAFTERS to ceiling joists: nailed lapped joint. The rafter should be birdsmouthed over and skew nailed to the wall plate Notes for surveyors / building control officers. Properties built during the 1960s and 1970s frequently do not have diagonal bracing and all of the necessary longitudinal bracing. Even if the roof shows no signs of any deformation it is important that such bracing is added retrospectively. Where a pitched roof abuts the wall at an angle, a stepped cavity tray linked to a stepped flashing should be used.

Ridge and hip tiles are bedded in 1:3 cement : sharp sand with plasticiser mortar or mechanically fixed using a proprietary dry ridge fixing system following the manufacturer's instructions. The method shown in the design should always be used. On most dormers, the DORMER CHEEK STUDS should be supported either by a double rafter or by a double floor joist. Notes for specifiers and builders. The advice provided by trussed rafters manufacturers should be carefully adhered to and bracing in non standard situations should be applied. Sin No 4 Overloading / under loading

Advantages of Trussed Rafters

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.

Battens should be fixed with cut or wire nails. The nail shank can be smooth, annular ringed or helically threaded. Nails can be steel or aluminium. In coastal areas, steel nails should be hot dip galvanized. (d) slates and tiles Most often, roof truss clips are included in your overall quote. However, should you need to buy these, you would be looking at a cost of around 25-40p per clip – a very minimal cost. This is a small price to pay to ensure your designs are validated and safe. 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 All verge tiles and slates should be bedded on an undercloak. Alternatively, proprietary dry verge systems should be fixed in accordance with manufacturers' recommendations.It is essential when installing celotex rigid insulation boards in cut to fit roof applications to ensure they are secured firmly. Insulation boards falling down on your head is no fun and also you really don’t want the weight of the boards resting on your plasterboard finish. Celotex insulation clips are and ideal purpose made fixing that ensures the PIR insulation boards are kept firmly in their place. The advantage of these clips is that if you have uneven timbers or if you are unable to cut the insulation to fit tightly in between the timbers. Then these fixings will work perfectly holding the insulation in position. Dormers should be framed up so they are independent of the window frame, using a suitable lintel over the opening.