Rockprime Blown Loft Insulation
Installation guide: ROCKPRIME BLOWN LOFT INSULATION
Ventilated Pitched Roof - Between and Over Ceiling Joist
Prepare for the installation In the loft, a depth gauge must be fixed to the joists to assist with measuring depth prior to the installation. Rockprime Blown Loft Insulation thickness is adaptable according to U-value requirements. | 
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To prevent disturbance of the Rockprime blown insulation when gaining access and leaving the loft space, a Rockwool board is fitted around the joist/trimmers as shown. At the end of the installation, existing loft hatch covers will also be insulated where necessary. |  |
| Installing Rockprime A Rockprime bag is put in the machine hopper.The machine blows the insulation through the hose into the loft. Rockprime is compatible with other insulation types and can therefore be used in top-up situations. |  |
Installed Rockprime Rockprime offers many benefits over traditional loft insulation. It provides no voids, no gaps and a perfect mattress of insulation. With the Rockprime system, the end user is assured that the contractors installing the insulation are trained and approved by Rockwool in the best practices of loft installation. Rockprime has been tested to the highest standards by the BSI, BRE and is approved by the Energy Savings Trust. |  |
General conditions It is essential that the 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.
Refurbishment and new build: It is essential the roof space is ventilated to meet the requirements of BS 5803: Part 5 :1985. Appendix B. Proprietary eaves ventilation protector should be used when necessary. Please contact a manufacturer for further details. |  |
Chimney breast: Due to the non-combustible properties of Rockprime Blown Loft Insulation it can be installed up to and around the chimney breast.
Storage: Loft insulation of all types must not be compressed as this will decrease dramatically its thermal performance. You have 3 main options: › Before you fit any boards, install a second set of joists across your insulated horizontal joists. Then insulate between these too, to bring the total depth of insulation to around 270mm. This will mean more outlay - but greater savings. › Insulate horizontally up to the top of the joists, as normal, and then fit boards across them. This will make the insulation a lot shallower than 270mm, so won't save as much energy (refer to Ofgem guidelines). › Do as in option 1 in just a part of the loft, then insulate the rest of the loft as normal - i.e. at right angles to the joists and up to a depth of 270mm. |  
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Electrical cables: British Standard BS7671: 2008 provides guidance on the correction factors to be applied in down-rating covered cables according to cable rating, cable length and duty. Where possible, all cables should be lifted free of the insulation.
Downlights Down lighters should not be directly covered by insulation. › They must be left exposed to the air for a minimum clearance of 75mm. › Down light protection can be used for addressing this requirement. Please contact a manufacturer for further details. |  |
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 : granulate@rockwool.co.uk / granulate@rockwool.ie (for the Republic of Ireland)
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