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How to Install Box Profile Roofing Sheets?

To install Box profile 32/1000 roof sheeting lay it either left to right or right to left. If you require to lay right to left just simply turn the sheet around, making sure the overlapping edge is at the start of the process ready for the next sheet to overlap the underlapped side (as shown). We recommend laying away from the common prevailing wind to help prevent wind whistling and water capillary. Please note the overlapping edge is always the unfinished castle overlapping the finished castle.

Fixing screws are highly recommended to use between the strengthening ribs in the valley of the sheet (as shown). These are usually fixed in the 1st, 3rd and 5th trough (left, middle, right) to have a symmetrical appearance and a strong holding into the purlins. Fix in every purlin if possible but every two is adequate on short purlin spacings.

Box Profile 32-100 Installation
Image shown is for illustration purposes only

Fitting Box Profile Roofing Sheets

We recommend using a maximum purlin spacing of 750mm for 0.5mm and 1250mm for 0.7mm, but not going any more than 1000mm for 0.5mm and 1500mm for 0.7mm unless it’s necessary.

Stitching the sheeting overlaps is very important (as shown). Stitching the overlapping castle every 500mm is adequate but you can fix anything up to 750mm if necessary. This will help prevent water capillary seeping underneath the sheet. Also adding silicone to the join will help decrease this even further.

If rooflights are being used, they operate in the same way as the steel sheeting. But clear silicone must be applied all the way around the sheet when being fitted to create a watertight seal.

Ridge and Barge flashings are always fitted after the sheeting. Again, using the stitching screw to fix through the flashing into the castle of the sheeting. Once this process is complete then fitting a foam infill between the ridge end and the eaves end is recommended to help prevent birds / vermin entering the structure at the same time stopping wind pushing anything through during poor weather conditions. (Please note we DO NOT recommend using foam infills if you have our drip stop/anti-condensation membrane system installed to your sheeting due to the roof requiring ventilation for the drip stop to work at its optimum).

How to Install Box Profile Roofing Sheets Which Require Cutting

If the sheeting or flashings need cutting / trimming, we recommend using a ‘Nibbler Attachment’ due to the clean precision cut it can offer. Angle grinders are commonly used but this will not offer a clean cut. A Nibbler will be the most sufficient tool for this.