Best practices for tar paper installation on walls?
Our new build house has been standing without siding for two years. I am about to replace the weathered tar paper with two new layers of 15# felt before siding the house with cedar clapboards. The house will have a ½” rain screen gap made of strips of PT plywood. The walls are intended to dry to the outside. We’re in the coastal rainforest of Southeast Alaska – very wet.
Traditional wooden sliders windows will be installed. The rough openings will be flashed with rubberized flashing and a solid sill pan (www.jamsill.com).
My plan is to apply two layers. The first layer will be held with a minimal amount of stainless steel staples, followed by another layer held with “Stinger” plastic-cap staples, followed by the furring strips for the rain screen. This will be done in quick succession, one wall at a time, so there’s no time for the felt to sag, blow away, or tear from the staples before the furring strips go on.
I have found surprisingly little information online about the best way to place tar paper on the walls. I would like to do a very well-detailed installation. Could anyone offer some proven methods for handling details such as:
Corners (should I avoid wrapping the corners with both layers? This would create four layers at the corner, which seems like it would impede drying through the walls). How much should corners be lapped? What about inside corners?
Overlap at horizontal seams
Overlap at vertical seams
Penetrations such as exterior lights and outlets
Shingling of the felt at the top of windows and doors(over head flashing, etc)
Anything else that requires close attention?
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