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Morturn Associates Limited

  • Member since 20 Sep 2011
  • wLocation: Torquay
  • rFeedback score: 2 jobs 100% positive
  • lInsurance verified: Limit £1,000,000
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  • >Restoration & Refurb Specialist
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Q

Firewall construction material and thickness

We are converting an old corner shop and the living accommodation next door and above into two individual houses. Pre-planning advice was positive and we are awaiting formal approval. Unfortunately the current party wall is only one single brick thick i.e. 4 inches plus plaster on both sides. As we are speaking to builders we are receiving conflicting information about the need for a more robust party wall/firewall. The advice ranges from (1). Digging 1m footings and building an insulated cavity block wall finished with dab and 12.5mm plaster boards plus a skim (2). Building an insulated 3 inch timber frame and dryline with 12.5mm boards plus skim (3). Fix fireproof 12.5mm fermacell board with special fittings and skim.

Would a fireproof board plus skim to one side of the wall and soundproof plasterboard plus skim to the other side be a viable solution? .

The total area to be covered including the loft/attic space is 60sqm per each side of the wall

Which solution would you recommend?

Thank you in advance for your advise.

Ybrum14 9th Jan, 2012 Restoration & Refurbishment
2 Answers
A

Building Control is the first stop. However suggesting several options to suit your requirments will be taken into consideration and any good builder will sugest solutions.
Tanalized 1"1/2 battens screwed to the existing wall with 2x fire line 12.5 mm
gypsum board first layed horizontally the next screwed' vertically will give you an hour's fire saftey.Infill the batten with 50mm rockwool and you increase the fire rating and get better sound insulation. (only infill if the party wall is above ground and totally dry) Morturn Associates Ltd.

Morturn Associates Limited 11th Jan, 2012
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