Side Lapping Roof

Why a side lap joint matters.

Side lapping roof.

Tile effect sheet side laps. Position the tape with the release backing on the top side. As with side lap roofing it s good practice to use lapping tape to help create a robust weather resistant joint. Below you will find examples of side lap details for our most popular profile types.

The position of purlins at the upper and lower ends of the roof and at the sheet overlaps are the critical points there must be purlin where you need to nail. Apply side lap sealant if the pitch of your roof is 2 12 or less. The disadvantage compared to double lap is that the perpendicular joints at the arrow are simply butted together and so are open to leaks unless they are sealed in some way. Place the first sheet and following sheets with their side lap fitting closely over the sheet laid before it.

Span roofing roof sheets. Single lapping is an economical form of roofing because there is just one layer of slate over most of the roof and a double layer just where the slabs overlap vertically. Corrugated roof sheets. Side overlap is number of corrugations.

10 4 end lapping 52 10 5 expansion 54 10 6 roof overhang with edge stiffener 55 10 7 sheet ends on low slopes 55 11 0 flashings 56 11 1 materials 56 11 2 longitudinal flashings 56 11 3 transverse flashings 57 11 4 flashing at change of pitch 59 11 5 flashing large roof penetrations 59 11 6 flashing small roof penetrations 61. Ensure that sheets are fitting well at each stage of laying until the final end of the sheet has been laid. This is ideal for lapping because the sealant stays sticky rather than hardening. Flow tile and wave tile can only be laid right to left whilst brit tile can only be laid left to right.

In other words if the height of the roof drops by 2 inches for every 12 inches in length you will need to use sealant to strengthen the overlap barrier. When two pieces of metal deck with the same profile are adjacent a side lap joint can be used to fasten the two sheets together by overlapping a portion of each sheet by using a side lap fastener. On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. Peel back the release backing to start the application.

This lap must be supported underneath by a purlin to be secure and long lasting. Crest fixing and side lapping. Purlins must be at the correct centres and size for the material and slope of the roof. Five rib roof sheets.

Lay 6 inch wide butyl tape over all horizontally lapping end seams. For end lap joints a minimum sheet over sheet overlap of 250mm should be allowed for where the sheets lap. How a side lap joint works.