This is done to ensure a flat surface for the roof felt.
Old felt flat roof.
But if the felt roof is done with good thickness high performance felt it should last a long time depending on when it was done.
Also you will need to remove any old felt on the roof as well as any nails or roof staples.
Item 656632 model 0903000.
There needs to be an overlap in the felt to help increase the water tight quality.
Paint a thin layer of adhesive over the first felt layer.
You will be placing the second layer of felt over this.
Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.
The old felt should be stripped off and the boarding aswell so you have a clean service for rubber or you can primer for a fibreglass roof.
Hope all goes well.
Lay down felt and secure to roof.
It s best to start nailing in the center and work out from there.
This is now one of the most widely used systems across the uk.
You wan walk over the roof to remove any air bubbles that may form.
Roofing felt is one of the oldest available options and advances made in the past decade or so have begun to move more towards the torch on approach.
You must remove any rotted pieces of wood on the roof and replace them with your plywood planks.