Box profile sheets are always fixed with a tech fasteners in the valley trough part of the sheet directly into the purlin underneath.
How to fix box profile roofing sheets.
Installing the sheets is simple to do using cladco screws for installing box profile 34 1000 the recommended installation is through troughs 1 3 4 and 6.
The lower end of the sheet can be fixed through every trough to ensure the wind does not uplift the steel sheeting.
Primary fixings should be in profile valleys where possible.
The bottom end of the sheets you can fix in each trough to help prevent wind uplift of the sheets.
Box profile sheet fixings trapezoidal or box profiled sheets should be fixed through every valley pan lowest point of the profile at every purlin with extra fixings being used at the ridge and eaves profiles for added strength.
To fix the sheets each 34 1000 box profile sheet has 6 troughs for securing we recommend you fix the sheet into trough 1 3 4 and 6.
These screws are purpose made fittings for these sheets and are drilled in with an 8mm socket driver fitted in the chuck of your electric drill.