Full Product Manual

ROCKWOOL

Vented crawl space installation

Vented simply refers to the space having air vents,

typically more than one, and they are generally located

across from one another at the upper part of the

foundation wall. The vents allow for an air exchange,

helping to eliminate dry rot, moisture build-up, and other

conditions that can develop in these enclosed spaces.

This type of venting would be very common in

older homes.

A vented crawl space is treated in the same manner as

a cantilever, or insulating a room where the underside

is exposed. The underside of the oor is insulated by

adding batt insulation between the oor joists.

Step 1

Seal all joints and penetrations with caulk and where required by local

building codes, install a vapor retarder to the underside of the sub-oor

before insulating.

Step 3A

Permanently hold the insulation in place by installing strapping on the

underside of the oor joists perpendicular to the insulation. Attach minimum

2 pieces of strapping using appropriate screw, nails or staples. Some options

for strapping include wood, plastic, wire and chicken wire mesh. At least one

piece ofstrapping should be installed for every 8 inches of insulation.

Step 2

Insert, Compress and Release to install ROCKWOOL Comfortbatt thermal

insulation between the oor joists.

Step 3B

Install an impermeable, foil faced insulating sheathing (taped or sealed joints).