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Cavity Wall and Dry Wall Insulation System

Airtec is a multi-layer air bubble film insulation with aluminium bonded to either one face (Airtec-Single) or both faces (Airtec-Double).

The aluminium is coated with polythene to give durability and corrosion resistance. Therefore creating a fully waterproof insulation system.

Airtec is a high performance insulation material which acts by trapping air within its structure creating low emissivity air spaces which enhance its total thermal capabilities.

Airtec can be used to enhance ‘U’ values in traditional cavity wall construction to meet and exceed current Building Regulations.

 

Airtec can be used in one of two ways:

Airtec-Single

Airtec-Single is to be used in conjunction with thermal blocks.

Airtec-Single is rolled to 25mm x 38mm vertical counter battens, thus creating the required air gap.

Once Airtec-Single is in place and joints sealed using Airtec YBS 75mm tape, then plasterboard (internal finish) is applied directly onto the Airtec and fixed directly through to the battens.

Airtec-Double

Airtec-Double is to be used in conjunction with medium dense blocks.

Airtec-Double is fixed to the blockwork-mounted horizontal counter battens thus creating the required air gap.

Once Airtec-Double is in place and joints sealed with Airtec YBS 75mm tape, then the vertical counter battens are fixed at the required centres, ready for direct application of the plasterboard (internal surface).

Airtec used in Cavity with Thermal Blocks.

Airtec-Single is to be used in conjunction with thermal blocks.

Airtec-Single is fixed to the inner leaf using special wall ties and YBS retaining Clips.

Airtec used in Cavity with all Medium / Dense Blocks

Airtec-Double is to be used in conjunction with medium /dense blocks.

Airtec-Double locates in the centre of the cavity using special wall ties and YBS retaining clips.

Airtec used in Dry Lining Systems with Thermal Blocks.

Airtec-Single is to be used in conjunction with thermal blocks.

Airtec-Single is rolled to 25mm x 38mm vertical counter battens,thus creating the required air gap.

Once Airtec-Single is in place and joints sealed using Airtec YBS75mm tape, then plasterboard (internal finish) is applied directly onto the Airtec and fixed directly through to the battens.

Airtec used in Dry Lining Systems with all Medium / Dense Blocks

Airtec-Double is to be used in conjunction with medium / dense blocks.

Airtec-Double is fixed to the blockwork - mounted horizontal counter battens thus creating the required air gap.

Once Airtec-Double is in place and joints sealed with Airtec YBS75mm tape, then the vertical counter battens are fixed at the required centres, ready for direct application of the plasterboard(internal surface).

Suspended Timber Floor Applications

Airtec-Double is a multi-layer foil bubble laminate, coated with polyethylene to provide a corrosion resistant insulation system.

Airtec-Double is a high-performance material which acts creating a low emissivity air space below the floor, thus reflecting the heat back.

Airtec-Double can be applied to enhance ‘U’ values in new build or refurbished building projects to meet and exceed current Building Regulations.

Airtec-Double is rolled out over the joists
Airtec-Double is then nailed in place through the Airtec Saddle Clips to maintain required air gap - 4 per m2

The horizontal joints are overlapped by 100mm and are left open to allow any moisture accumulation to dissipate
Airtec-Double must be brought up (behind the skirting board) to 75mm
The decking is then fixed with screws (at 200mm centres) 37mm into the joist.

Joist End Fitting Recommendations

Make 2 x 75-100mm cuts in Airtec, same width as joists.
Then make one further cut, same width again, on each side.
Fold up flap (A), fold back Flaps (B) and pull Airtec (C) up to meet wall.
Fix to wall and fit skirting board over, concealing Airtec.
The heat loss in a floor is greater at the exposed perimeter edge of the floor.

To calculate the U-Value, the exposed perimeter edge to area ratio needs to be worked out e.g.

A semi-detached house of 100m2 area, with 3 external walls of 10m each has a perimeter edge to area ratio of 0.3 (i.e. 30m -: 100m2=0.3).
Overall thermal transmittance (U-Value) of suspended floors should be calculated using BS EN ISO 13370

 

Airtec Technical Specifications and Properties
	Thermal Resistance	Airtec-Single	Airtec-Double
	Bubble	0.125m2K/W	0.125m2K/W
	Cavity	0.665m2K/W	0.665m2K/W
	Total	0.790m2K/W	1.455m2K/W
	Environmental	CFC & HCFC Free	CFC & HCFC Free
	Dimensions
	Thickness	4mm	4mm
	Width	1050mm/1200mm/1500mm	1050mm/1200mm/1500mm
	Length	25m roll	25m roll
	Airtec Foil Tape	75mm	50 linear metres

Technical References and Certification

British Board of Agrément - Certificate No. 08/4565
Building Regulations 2000 (2006 edition) Approved Documents L1A,L1B & L2A, L2B.
Building Standards Part J Sept. 2001
BRE publication ‘Thermal Insulation: Avoiding the risks’.
BS EN ISO 6946 : 1997 Building components and building elements -Thermal resistance and thermal transmittance - Calculation method.
British Standard References: BS 5250Control of Condensation in Buildings.
Emissivity measured by National Physical Laboratory.
Thermal resistance measured by Independent Test Laboratories.
Tested to BS EN 12153:2000 for water tightness and air permeability.
Manufactured in the UK and meeting the requirements of BS EN ISO 9002.

Condensation Risk

Further to calculating the thermal insulation requirements through a cavity wall, a check should be made for predicting the risk of condensation within the structure.
This should be carried out using the method described in BS5250:1999.

Page last updated Tuesday, June 1, 2010->