Screw the 2 by 4 directly into the roof to secure it.
Temporary roof construction.
The traditional material used to cover a temporary roof scaffolding sheets of corrugated iron.
The roof should have a pitch of at least 10 to shed rainwater.
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Then fold the excess tarp under a few rotations for a tight clean fit.
Also sometimes known as tin sheets or ci sheets putting a tin hat over a construction project is still used today.
For temporary roofs over 6 metres wide or where the entire sheeted area cannot be accessed from underneath the sheeting must be installed from above.
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Lay more 2 by 4s on either side of the tarp and attach those as well for a tight well secured water barrier.
The 2 by 4 should be about 2 feet longer than the tarp width.
After the scaffolding has been erected sheets of corrugated iron are laid over the roof in an overlapped tile configuration and secured to the roof trusses beneath.
The roof should be fully boarded with a hand rail around the perimeter to provide edge protection.