Side Lapping Roof

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.

Side lapping roof.

Side overlap is number of corrugations. Lay 6 inch wide butyl tape over all horizontally lapping end seams. Corrugated 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.

Position the tape with the release backing on the top side. On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. Tile effect sheets can only be laid in one direction this is due to the gutter detail at the bottom of the sheet. If you re installing a metal roof on a home without gutters you can overhang the panels by twice that amount.

Purlins must be at the correct centres and size for the material and slope of the roof. This is ideal for lapping because the sealant stays sticky rather than hardening. Why a side lap joint matters. 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.

Tile effect sheet side laps. Span roofing roof sheets. 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. Peel back the release backing to start the application.

Ensure that sheets are fitting well at each stage of laying until the final end of the sheet has been laid. Side lap roofing end lap joints. For end lap joints a minimum sheet over sheet overlap of 250mm should be allowed for where the sheets lap. 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.

Flow tile and wave tile can only be laid right to left whilst brit tile can only be laid left to right. Crest fixing and side lapping. Five rib roof sheets. How a side lap joint works.

This lap must be supported underneath by a purlin to be secure and long lasting. Apply side lap sealant if the pitch of your roof is 2 12 or less. Place the first sheet and following sheets with their side lap fitting closely over the sheet laid before it.