epsilonGreedy Posted September 23, 2020 Share Posted September 23, 2020 Looking at builder merchant web sites both widths of underlay are mainstream hence my confusion. I assume the fewer overlaps from using 1.5m rolls on a new roof is preferable. In the case of my hipped, L-shaped 30 degree pitch roof should I consider using 1.0m rolls? The felt might have to cope with a couple of months of exposure. Background Info: Cold attic space, 600mm truss centers and the felt will be drapped without sarking support. Link to comment Share on other sites More sharing options...
PeterW Posted September 23, 2020 Share Posted September 23, 2020 1m gets used for hips and valleys sometimes to stop having to cut down rolls. Tend to use 1.5m on big roof sections. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted September 23, 2020 Author Share Posted September 23, 2020 4 minutes ago, PeterW said: 1m gets used for hips and valleys sometimes to stop having to cut down rolls. Tend to use 1.5m on big roof sections. Thanks. I was concerned I might have to buy a roll width that was a nice round multiple of the batten centre distance. Link to comment Share on other sites More sharing options...
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