Installing Hardie Siding Over Foam

How to install rigid foam under siding.

Installing hardie siding over foam.

Insulation is everyone having as much hell as i am installing fiber cement siding over 1 2 foam. This only increases the wall thickness 3 4 inch vs the furring strips william costello was planning to use and would only require increasing the interior window sill by 3 4 inch. Siding over rigid foam a vented drainable air space keeps wood siding dry and stable. Things are going to get interesting when iecc 2012 is adopted which requires exterior foam zones 6 and up.

We put 2 x 4 furring studs laid flat over the foam and attached to the wall studs with 1 5 inch foam between the furring studs rain screen over everything and finally the lp siding. Or directly to minimum 7 16 thick osb sheathing. Our company plans on removing old siding installing new 1 foam then new hardi plank siding. Installing fiber cement siding over rigid foam sheathing i think the hardie instructions only allow for 1 foam like sailboat said sounds like mark s house is just fine however.

We had hoped to use 1 5 to 2 inches of eps rigid foam to the exterior of the sheathing then 3 4 inch x 4 inch plywood furring strips then lp smartside lap siding. Becouse the foam compresses. Gypsum sheathing up to 1 inch thick the foam sheathing and other non nailable substrates do not have nail holding capacity. We re building a new home sw virginia with 2x6 studs on 24 inch centers.

It then pops the nail right through the siding. My entire house is hardie over 3 4 foam that was gun nailed. The walls are 2x4 stud filled with guessing r 2 fiberglass batts with foil backed drywall inside and 1 2 crumbly yellow foam outside and vinyl siding over that. We will be leaving in the old windows.

Hardiplank lap siding can also be installed over foam insulation up to 1 thick irregularities in framing sheathing and or foam insulation can mirror through the finished application. Lower the pressure on the gun and make sure the gun has depth of drive. When applying james hardie siding directly over the combined thickness of foam sheathing continuous insulation and other non nailable substrates e g. Installing hardie over 1 quot.

Many houses built today have a double wall type of insulation with fiberglass batts fastened between the studs on the inside and rigid foam board over. We knew we had to use the 76 series smartside product for the 24 inch centers. Then i discovered that lp s installation instructions specify 1 5 inch x. These discussions will be quite common.

Siding over rigid foam view all 5 photos play slideshow. Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c.