How To Install Iso Board Under Siding

Wrap the house with a moisture barrier usually some type of polystyrene wrap and install desired siding by nailing through the foam board into the house framing.

How to install iso board under siding.

The siding and insulation offer a well insulated home. Just want to make sure the job is being done correct i don t want to find out in hindsight that a 1 4 or 1 2 inch of rigid foam board should have been put under the vinyl shake. In this example we show z flashing below the first course of siding and we show perforated board wrapped with insect screening to allow air entry at the base of the wall. With foil faced iso on the interior you could still use up to 2 of unfaced type i or type ii eps under the siding without creating a moisture trap.

To secure the foam use two inch cap nails. Once the plywood is installed it s then time to install the siding over the top you can choose to use either vinyl or aluminum siding depending on the age style and look of your building. Secure the board positively using screws and adhesive to fix to perimeter brandering on the board s ends and concealed fastening clips and adhesive to fix the board to the central brandering. He stated no further insulation under the shake since i do have insulation under the bead board and the concern is what i ve read above about condensation.

Some people use roofing nails but if a strong gust of wind gets under the siding it may not hold. Fit the rigid foam insulation snugly and seal all seams with the specialized tape. It s not nearly as vapor permeable as rock wool but it s still well over 1 perm it s semi permeable and plenty of drying capacity for anything but chronic gross bulk water leakage from mis.