Fitting additional insulation to exterior walls from inside -

Fitting additional insulation to exterior walls from inside -

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.

Step 3

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

mm c/c.

Paroc Building Insulation

February 2007

Step 4

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,

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.

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