English to Polish Tech/Engineering Construction / Civil Engineering pokrycia dachów

4. Rafter Roll
Roll out continuous rafter roll over rafters
and position so as to keep the roofing
underlay separate from the insulation below.
Secure to rafters with felt nails through the
circular indentations in the continuous rafter
roll (2 nails at every rafter intersection).
Wygląda to na rysunku jak jakaś mata rozwijana na tych krokwiach i tak wynika z kontekstu-leżę i kwiczę