The advantage of insulating from inside is that you
can do it at your own pace. You take one room at
a time and don’t need to worry about wind and
Another advantage is that you can vary the thickness
of insulation depending on the type of the room and
the desired result.
Step 1 Step 2
Remove skirting boards and ceiling
mouldings as well as door and window
frames. If in poor condition, replace also
the interior folding as well as any plastic
Fitting additional insulation
to exterior walls from inside
Installation instructions of Paroc stone wool
Attach battens around doors and windows.
If you want the windows or doors to open
more than 90°, position the battens a bit
further from the frames. Seal the joints
around windows and doors with caulking
• As the heat no longer penetrates the wall from inside thanks
to the improved insulation, the exterior wall may stay frosted
longer. If your property has a frost-sensitive facade, such as
old rendering, consult an expert (for example, the municipal
building inspector or your building material supplier) before
starting the insulation work.
• The procedure shown usually requires a certain amount of
rewiring, fitting new pipes and reorganising old ones – contact
your local electrician and heating and plumbing installer.
• Check that there is plastic sheeting in the exterior wall and that it
is intact and firmly attached to the roof and floor.
• If you are going to add new insulation to the thickness of more
than half of the existing insulation, attach new plastic sheeting
on the inside of the new insulation slabs.
• Nail nogging pieces below windows as radiator abutments.
Attach battens to the walls along the floor
and ceiling and secure them to the corners.
Don’t forget to insulate the corner. Attach
the vertical joist system at a distance of 600
Paroc Building Insulation
Fit the insulation slabs so that they cover the entire space between the battens. Avoid using small slab pieces and insulate joints tightly.
Step 5 Step 6
Fit plastic sheeting if there is none in the
existing wall. Position the seams over
battens leaving a minimum overlap of 200
mm. Fit the plastic sheeting over windows
and doors and attach it to the frames. Seal
carefully around the sockets with tape.
Fit the new cladding sheets. Make holes
for sockets and vent openings. Fit skirting
boards, door and window frames. Finish
with plaster, paint and wallpaper.
PAROC OY AB Building Insulation, P.O.Box 294, FI-01301 Vantaa, Finland, Telephone +358 204 55 4868,
Telefax +358 204 55 4738, www.paroc.com
The information in this brochure represents the sole and comprehensive description of the condition of the product and its technical properties. However, the
content of this brochure does not mean granting a commercial guarantee. In so far as the product is used in an area of use which is not provided for in this
brochure, we cannot warrant its suitability for said area of use unless the suitability was expressly confirmed by us upon request. This brochure replaces all
previous brochures. As a result of constant further development of our products we reserve the right to make alterations to brochures.