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• Add the new line of insulation between the rafters at the same thickness because the insulation line over or

When the boards are tightly butted together, the tapered edges of the plasterboard are sealed with scrim tape and jointing compound to type a highly effective vapour Management layer with a high vapour resistance.

Reply Trish February 3, 2016 at four:30 pm Hello,Now we have acquired a Victorian house that has been uncared for in a few considerable years. We've got experienced new heating installed and would like to insulate the attic but would like some advise on ventilation and insulation. The roof is slate tiles and underside of wooden battens, no roof felt, no vapour barrier etcetera.

Put a breathable felt down then cross batten with the tiles can we nonetheless have to ventilate under the shut boarding? Can we drive in say 100mm and have a smaller sized 20mm insultation board under the rafters to stop the thermal bridging in this way? Just want to be certain.

Thank you for the remark. This a single looks to become slightly challenging. To meet the necessary U-value the roof would wish to return off and 60mm of Celotex FR5000 can be needed over the outside with the rafters with an additional 60mm FR5000 among the rafters.

Hello Samantha. I’m in the middle of picking external finishes have a peek at this website for our house renovation/extension and came upon your site. It’s very fascinating and beneficial thank you! I’d love some assistance from you if possible.

To be able to retro suit a fresh line of insulation towards the underside in the joists a little bit of investigation might be needed I’m fearful. The Roof will need to be checked to see when there is any insulation either within the joists or in addition to the joists as a warm roof construction.

2. Should the rafters are entirely stuffed then a counter batten needs to be used prior to the tiling batten. The counter batten therefore creates an airspace amongst the breather membrane and tiling batten Recommended Site for humidity to run from the roof.

Arguably no ventilation is required as utilizing a breather membrane. Having said that I want to leave a 50mm ventilation gap among the membrane and insulation and in addition more than fascia vents. Most likely overkill but am I making difficulties than I should really pay attention to. Also is there a blended insulation plasterboard witha VC layer which can be used beneath the rafters?

This is often typical exercise when an old fashioned black sarking felt is set up and commonly found in existing buildings.

Only where a breather membrane is staying used By itself without some other method of sarking or boarding in excess of the rafters do you not must ventilate.

When insulating pitched roofs The 2 major considerations are to ensure that you've got a minimum 50mm effectively ventilated cavity as well as a ongoing vapour Regulate layer.

You may also help unfold the term about roof coating frauds, overlook-marketing and poor organization exercise by accomplishing any of the next:

We would wish to find out the size and spacing from the rafters to be able to give an answer. They’d be delighted to reply by using 01473 820850 or by way of e mail on roof tiles botswana isles.

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