Tools & Documents

Installation guidelines for ventilated facades

Ventilated facades: masonry wall

Install slabs tight to the masonry wall. Use one layer of PAROC WPS 1n, or multi-layers with PAROC eXtra and PAROC WPS 3n.

Install PAROC WPS 1n insulation with butt joints by using mechanical fasteners. Select the fasteners according to the characteristics of the massive wall. Install the fasteners during bricklaying or at the same time with PAROC WPS 1n slabs.

When installing fasteners with a PAROC WPS 1n slab, drill a hole with a Ø 6 mm and a depth of 35 – 40 mm through the slab to the masonry wall. Plug a stainless steel bond into the hole and snap the anchor to the masonry wall by using a punch-tool. Press a washer to the bond so that the PAROC WPS 1n slab is well attached to the structure. Normally, four fasteners are required. Corners and the spaces around windows and doors require more fasteners.

When insulation is done in several layers with PAROC eXtra and PAROC WPS 3n, press PAROC eXtra slabs through the brick bond installed during bricklaying. Make a small slash on the PAROC WPS 3n facing in order to get brick bond through the facing and ease the installation of the PAROC WPS 3n slab. Press anchor washers to the bond in order to firmly attach the insulation to the masonry.

For air tightness in the outer corners, use PAROC XST 021 wide corner tape. Seal the slab seams with PAROC XST 020 tape.

Timber frame walls

(+ 50 mm studding inside, wind protection slab)

To ensure that insulation fills the entire space, cut the PAROC eXtra slabs with 2 – 5 mm of excess width.

Install PAROC eXtra slabs between the timber frames. Use whole slabs and install the edges carefully. Seal the joints around windows and doors with PAROC XSI 006 caulking band. Use the blade of the cutting knife to ensure that installation fills the entire timber frame.

Note: If PAROC eXtra slabs are installed after the wind protection slabs (e.g., PAROC WAS 25, PAROC WPS 3), there is a risk of round corners/edges, which results in thermal loss.

	To guarantee that the facade panels are firmly attached, nail a horizontal studding to the top and bottom of the frame and secure studding around windows and doors.
	Install the wind protection slabs (PAROC WAS 25 or PAROC WPS 3n) outside the timber frame so that the facing is outwards. Install the slabs with butt joints. Use nails or screws and washers for preliminary fastening (5 – 6 per slab). When using PAROC WPS 3n as wind protection slabs, use PAROC XST 021 wide corner tape in the outer corners. Also seal the slab seams with PAROC XST 020 tape.
	After installing all wind protection slabs on the wall, push to the spacers at a distance of about 600 mm (according to the timber frame).
	If you install horizontal cladding outside, nail vertical grid siding through the spacers.
	If you install vertical cladding, first nail the vertical grid siding and then nail the horizontal grid. Finalise the facade.
	Install PAROC XMV 002zcf vapour barrier inside the timber frame. Paroc recommends studding of 50 – 100 mm inwards from the vapour barrier. All electrical installations can be made in this space without breaking the vapour barrier. The studding can be either vertical or horizontal
	After electrical installations, carefully install PAROC eXtra slabs with 2 – 5 mm extra width to the frame. Finalise with gypsum boards and interior materials.

Adding insulation outside to timber frames insulated with wool or cutter sawdust.

	Remove the old facade and wind protection slab. Seal the gaps and repair any mouldy or moisture-damaged structures.
	To guarantee that the facade panels are firmly attached, nail horizontal studding to the top and bottom of the facade and secure studding around windows and doors.
	Install wind protection slabs (PAROC WAS 25t or PAROC WPS 3n) outside the timber frame so that the facing is outwards. Install the slabs with butt joints. Use nails or screws and washers for preliminary fastening (5 – 6 per slab).
	When using PAROC WPS 3n as a wind protection slab, use PAROC XST 021 wide corner tape in the outer corners. Also seal the slab seams with PAROC XST 020 tape.
	After installing all wind protection slabs to the wall push to the spacers at a distance of about 600 mm (according to the timber frame). The highest row of the spacers should not be more than 200 mm below the connection of the wall and roof.
	If you install horizontal cladding outside, nail vertical grid siding through the spacers.
	If you install vertical cladding, first nail the vertical grid siding and then nail the horizontal grid. Finalise the facade.

Additional insulation for exterior walls from the inside

As 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 (e.g.,, 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.
Be aware of what the old structures contain. Check that there is a vapour barrier in the external walls and that it is intact and firmly attached to the roof and floor.

When adding insulation inside, a maximum one-third of the thermal insulation capability of the whole wall structure may be inside the vapour barrier.

	Remove mouldings and frames around the door and windows. Inspect the structure and condition of the old external wall. Remove the vapour /air barrier if it is in poor condition or the insulation capability of the old structure does not fulfil the one-third rule described above. Remove all air-tight layers.
	Install studding around doors and windows. If you want the windows or doors to open more than 90^o, position the studding a bit farther from the frames. Seal the joints around the windows and doors with caulking band PAROC XSI 006 caulking band.
	Install studding to the walls and floor and ceiling and secure them to the corners. Don’t forget to insulate the corners. Attach vertical studding to the wall at a distance of cc600 mm. Install PAROC eXtra slabs between the studding. Avoid using small pieces (< 200 mm).
	Install PAROC XMV 020 vapour barrier if you have removed the vapour barrier earlier. Overlap at least 200 mm and seal the seams with PAROC XST 020 tape. For sealing the windows and doors, use special formatted PAROC XMV 002. To make the connections of wall and ceiling corners air tight, use PAROC XMW 003. Carefully seal the sockets with PAROC XST 020 tape. Seal vent openings with flexible PAROC XST 100.
	Install gypsum boards or a similar final layer. Make holes for sockets and vent openings. Finish with plaster, paint and wallpaper. Attach mouldings and frames around all doors and windows.