The 2 by 4 should be about 2 feet longer than the tarp width.
How to secure a tarp on the roof.
Never lay the tarp out during a storm.
If required cut plywood as needed cover up any existing penetrations with plywood secure the perimeter with screws every 6 to 12 into the roof sheathing below preferably into trusses unroll the full tarp make sure that the length extends 1 past the edge of the roof on the damaged side.
Screw the 2 by 4 directly into the roof to secure it.
This will prevent water and debris from entering the damaged area.
Pull the other end of the tarp over the peak and down the roof far enough to cover the leak then secure that end to another 2 by 4.
Find the source of the roof leak.
The screws must pass securely into the roof.
It is best to also weight the tarp down with sandbags or heavy objects to keep wind from blowing up under it.
You can use 2 3 inch wide double sided tape to secure the tarp to the tile.
Extend the top edge of the tarp over the ridge of the roof.
Secure the tarp s remaining sides with additional 2 x 4 boards using your screw gun and screws.
Lay more 2 by 4s on either side of the tarp and attach those as well for a tight well secured water barrier.
Positions several 1 2 pieces of lumber on the tarp running vertically down the slope of the roof.
Fully secure your roof tarp to prevent flapping.
Then fold the excess tarp under a few rotations for a tight clean fit.
To begin securing the tarp screw through the rolled 2 x 4 boards with your screw gun.
On a shingled roof you just nail the tarp in place using furring strips but you can not nail a tarp into a tile roof.
You want to get long 3 inch nails to get plenty of bite into the roof s sheathing and still be able to bend an upper portion of them to secure the tarp.
Lay the tarp across the roof so that at least 4 feet 1 2 m lies on the sloped part of your roof on each side known as the peak.
Once every grommet has a bent nail in it add a dab of roofing tar into each grommet hole around the nail that penetrates the roof to protect against leaks.
Let the rest of the tarp hang off the lower border of the roof that overhangs the wall known as the eave.
Lay the tarp out flat over the roof.