They all used rolled asphalt felt material commonly referred to as tar paper.
Peel and stick double roof.
Gaf liberty 3 ft.
I ve marked in red the lower edge of each course of roofing felt.
Gaf liberty 3 28 ft w x 66 ft l 200 sq ft black roll roofing.
Mineral surfaced peel and stick roof leak barrier roll model 0914000 110 00 roll 110 00 roll free delivery.
Gaf self adhering base sheet for low slope roofing is suitable for primed plywood deck and many other substrates.
My photo of an asphalt roof installation in process shows that the contractor has installed a peel and stick waterproof ice and water shield type product along the roof eaves in a 36 wide strip.
Using peel and stick underlayment makes a better roof.
Above that is an incomplete double coverage layer of 15 pound roofing felt.
Until recently all shingle roofs had the same type of underlayment.
Gcp applied technologies grace ice and water shield ht.
The only way to improve the quality of the underlayment was to make it thicker or add another layer.
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Gaf weatherwatch 200 sq.
Ft sbs self adhering base sheet roll for low slope roofing 3733000 the home depot.