Side laps are created when you lay the sheet side to side. You must always remember to lay the overlap detail over the previous sheet. Overlap details are the shorter unfinished sides of the sheets which help prevent capillary action drawing water in through the overlaps.
Please be aware that you can overlap sheets by additional corrugations if you need to reduce cover width rather than cut sheets down the full length.
Below you will find examples of side lap details for our most popular profile types.
Tile effect sheets can only be laid in one direction, this is due to the gutter detail at the bottom of the sheet. Flow-Tile and Wave-Tile can only be laid right to left whilst Brit-Tile can only be laid left to right. Please see below for examples of tile effect overlaps:
Important Due to the nature of the overlap detail we would highly recommend the use of Butyl sealant when using Brit-Tile sheets.
If end laps are required you should allow 300mm minimum overlap, sealed with butyl sealant tape 10mm from the edge of each overlapping sheet as well as in the middle of the overlap. Any end laps must be supported by a suitable purlin.
Important When using anti-condensation lined sheets it is very important that you negate the properties of the liner on any part of the sheet that is going to be overlapped. This will ensure that the liner will not draw water into the building. The most effective way to stop anti condensation liner from working is to coat it with a varnish and allow it to dry prior to fitting. Alternatively you can heat it with a heat gun. (When burning the liner it will turn black meaning that its absorbent properties will be negated.) You can also scrape the liner off the sheets. Please bear in mind removal of the anti condensation liner by scraping it off is very difficult and time consuming and is only recommended as a last resort.