32/1000 roof sheeting can be laid either left to right or right to left. If you require the lay right to left 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 crown overlapping the finished crown.

Fixing screws are highly recommended to screw between the strengthening ribs in the valley of the sheet (as shown). Fixing in every purlin if possible but every two is adequate on short purlin spacings.

32/1000 roof sheeting (trapezoidal single skin) has 5 crowns & 2 strengthening ribs in the troughs with a profile pitch of 252mm and profile depth of 32mm

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 are very important (as shown). Stitching the overlapping crown every 500mm is adequate but if you can fix anything up to 750mm if necessary. This will help prevent water capillary seeping underneath the sheet.

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 water tight seal.

Ridge and Barge flashings are always fitted after the sheeting. Again, using the stitching screw to fix through the flashing into the crown of the sheeting. Once this process is complete then fitting a foam infill between at 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.

Important Note: We do NOT recommend using foam infills if you have our Dripstop membrane system applied to your sheeting due to the roof requiring ventilation for the Dripstop to work at its optimum.

If the sheeting or flashings need cutting / trimming, we recommend using a Nibbler due to the clean precision cut it can offer. Angle grinders are commonly used but this will not offer a clean cut.