As for iso board vs.
Foam board roof vent.
All insulation materials require proper venting.
Attach the tongue and groove insulation boards to the concrete wall with adhesive.
For a basement remodeling project consider insulating basement walls with foam board.
Some people nail flat 2x4s on top of their existing roof and build a new roof to create a vent space but it would be hard to justify the cost for a workshop.
Simply peel the backing and install.
Foam insulation can play an important role in both vented and un vented roof assemblies.
Just peel the backing as you install.
The plyco quick vent is non wicking highly pliable while still providing a superior airflow.
In an un vented roof foam can serve as the air barrier and vapor retarder and prevent moisture from getting in to the roof.
Plyco quick vent comes in 2 x 10 lengths for quick and easy installation.
For new construction use rigid boards to insulate slabs and the outside of foundation walls.
Spray foam the iso board would be a lot cheaper especially if this is a diy project.
Owens corning raft r mate attic vent is an extruded polystyrene foam vent designed to assure unrestricted airflow from the soffit to the ridge vent.
Of airflow per linear ft.
Rigid foam and spray foam are two of them.
The superior adhesive helps make a complete seal.
Today there are more options.
Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t.
In a vented roof foam can seal the openings and serve as an air barrier and a vapor retarder in addition to its insulating function.
Additionally raft r mate attic vent has an optional bend down air stop or insulation block at the top plate of the wall in one easy to install product.
Vent a foam insulated roof there used to be a time when the only insulation available was pink fiberglass.
If you want to install rigid foam above your roof sheathing in climate zone 3 then 1 2 inch of rigid foam board is not ideal this rigid foam layer needs a minimum r value of r 5 and that s impossible with 1 2 inch of foam.
Foam board insulation with rigid panels polystyrene and styrofoam boards are low cost and quick and easy to fit to the large panel in the camper van.
So an unvented roof is probably your best option.
Intended for a roof pitch of 6 12 and higher it is recommended to use the cv3 vent for a roof pitch of 5 12 and lower installed without cutting or altering the roof structure made with fiberglass screen making it a mold and mildew free permanent solution to your ventilation needs while providing over 7 sq.
