From what I've seen on here, the general process is to cut holes (doors, roof vent, etc) in the foam body before applying PMF. However, I'm trying to plan my build to be incremental - I want to be able to add a skylight or a 2nd door or whatnot later. Could I just cut a hole in already-PMFed foam, apply a strip of PMF around the cut edges, and not suffer the wrath of the waterproofing and/or delamination gods?
Holes for windows and doors need framing for attachment and strength. Water inside is the enemy more than anything and the cloth coming loose and peeling is more a strength issue than leaking so it would be best to wrap over the holes but at least do strips.
You get a lot of strength in a completed closed structure but it's still foam and cloth. Steve
Interesting - thank you for the pictures! Have you had any problems with the cut edges of the PMF wanting to shrink away from the cut edge of the foam?
Fractangle wrote:Interesting - thank you for the pictures! Have you had any problems with the cut edges of the PMF wanting to shrink away from the cut edge of the foam?
No. Most of the shrinking is from the initial lay up.
George.
Gorrilla Glue, Great Stuff and Gripper. The three G's of foamie construction.