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| Installing Rockprime Blown Loft Insulation |
Ventilated pitched roof - between and over ceiling joist
General conditions before installation
It is essential that the Rockprime Blown Loft Insulation does not block the ventilation path from the eaves. It is also desirable that the loft insulation links to the wall insulation. The method of obtaining these two requirements will vary depending on building design and whether it is new-build or refurbishment. The following suggestions are for guidance only and each individual building will require separate assessment.
New-build: Extend the cavity wall insulation to the underside of proprietary ventilation trays fitted between the rafters as shown in the drawing below.
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To prevent disturbance of the blown insulation when gaining access and leaving loft space, a Rockwool cardboard ‘hatch box’ is fitted around the joist/trimmers as shown in the photograph.
Covers to loft hatches should be insulated with a minimum thickness of 100mm Rockwool Roll. Rockprime blown loft insulation can only be installed by qualified approved Rockprime installers, WARNING! Never rely on supplier or installer assurances as to their status as Rockprime Approved Installers. Always check with Rockwool. Genuine Rockwool Approved Installers will welcome this check.
Telephone:
0845 241 2586
Email :
for the Republic of Ireland. |
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Compatibility
Rockwool will not react with any metal components in the loft, nor will it cause loss of plasticiser from PVC cables and pipes.
The IEE wiring regulations, BS.7671:1992 and the current edition of the Electricians Handbook, give guidance on the correction factors to be applied in down rating cables according to the situation.
Each case should be calculated separately.
Fire
Rockprime Blown Loft Insulation achieved an A1 classification in accordance with BS EN 13501-1 and is therefore non-combustible as defined in UK and Ireland building regulations.
Acoustic Performance
Rockprime Blown Loft Insulation can improve the sound insulation of a building. 250mm of Rockprime Blown Loft Insulation, with an isolated 12.5mm plasterboard ceiling, achieved > 50dB reduction in a tiled roof construction.
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Rockwool Limited, Pencoed, Bridgend, CF35 6NY, UK
| 01656 862621 |
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