Insulation underneath the roof structure - nailed

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Insulation under the roof structure

Insulation is preferably done with one board length, from the roof ridge to the gutter.

If this distance is too important, 2 boards are used. The shortest board is placed closest to the roof ridge. The end seam joint should preferably coincide with a purlin. Finishing is done with a wooden batten (see situation 1). If the join does not coincide with a purlin a tape is applied to the upper plate (see situation 2) before installing the insulation this ensures any condensation moisture is drained off.

Insulation under the roof structure 

1. Purlin
2. EUROTHANE
3. Waterproof tape
4. Wood batten

Fixation of thin boards with screws or threaded nails with plastic washers

Preferably three good quality screws per purlin are positioned 20 cm from the sides and in the centre of the board width. 

Insulation, fixation of thin boards with screws or threaded nails with plastic washers

Screws or threaded nails and washers are preferably used. In both cases the fixings must penetrate a minimum of 3 cm into the wood.

Purlin maximum distance 1350 mm.

Seam finishing with vapour-proof tape is recommended.

Insulation, fixation of thin boards with screws or threaded nails with plastic washers

1. Corrugated plates
2. Purlin
3. EUROTHANE
4. Frame on the long side
5. Vapour-tight tape
6. Nails or screws

Recticel draws your attention to the danger of moisture accumulation behind the purlins.
This construction should therefore also be avoided with a metal roof plate.
If you want a flat ceiling and good seam joins or there is an issue of ventilation or avoiding condensation, then we recommend the QUATTRO system.

Thick boards with chair profile

The EUROTHANE boards are fitted against the purlins with screws or threaded nails with plastic washers.

The join between the plates is provided by the combination of a “W” type edge finishing and chair profile (5).

Preferably, three good quality screws per purlin, positioned 20 cm from the sides and the centre of the board width.
Screws or threaded nails and washers are preferably used.
In both cases the screws must penetrate at least 4 cm into the wood. 

Insulation, thick boards with chair profile

1. Corrugated plate
2. Purlin
3. EUROTHANE
4. Type 'W' edge sealing
5. Chair profile
6. Nails and screws 

Recticel draws your attention to the danger of moisture accumulation behind the purlins.
This construction should therefore also be avoided especially with metal roof plates.

Batten on batten assembly

This construction can be used both with thick and thin boards and is the ideal solution with climate control and/or moisture production.
An extension batten is positioned under the purlins (e.g. 70 x 40 mm) first.
The centre-to-centre distance is determined according to the operating width of the insulation board chosen.
The insulation boards are attached to the underside, parallel to these battens. They are temporarily held in place by a few nails. After fitting the next board, a planed cover batten (40 x 20 mm) is screwed into the extension batten above. The distance between these screws is 50 cm.
Due to the clamping action of the batten/batten joint an airtight board join is created that makes an extra frame redundant.
Moreover in this way you create an opening between purlin and insulation.

Insulation, batten on batten assembly

1. Corrugated plates
2. Purlin
3. Extension batten
4. EUROTHANE
5. Cover batten

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