Side Lapping Roof

Ensure that sheets are fitting well at each stage of laying until the final end of the sheet has been laid.

Side lapping roof. 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. As with side lap roofing it s good practice to use lapping tape to help create a robust weather resistant joint. Tile effect sheet side laps. Apply side lap sealant if the pitch of your roof is 2 12 or less.

Side overlap is number of corrugations. 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. This lap must be supported underneath by a purlin to be secure and long lasting. Flow tile and wave tile can only be laid right to left whilst brit tile can only be laid left to right.

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. Position the tape with the release backing on the top side. Purlins must be at the correct centres and size for the material and slope of the roof. Side lap roofing end lap joints.

Span roofing roof sheets. Peel back the release backing to start the application. On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. Lay 6 inch wide butyl tape over all horizontally lapping end seams.

Tile effect sheets can only be laid in one direction this is due to the gutter detail at the bottom of the sheet. This is ideal for lapping because the sealant stays sticky rather than hardening. Below you will find examples of side lap details for our most popular profile types. For end lap joints a minimum sheet over sheet overlap of 250mm should be allowed for where the sheets lap.

Corrugated roof sheets. 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. Why a side lap joint matters. If you re installing a metal roof on a home without gutters you can overhang the panels by twice that amount.

Five rib roof sheets. How a side lap joint works. 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.