Loft Conversion Part 11 - Insulate between rafters & breathable membrane. PIR board & Tyvek Supro
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- Опубліковано 3 жов 2024
- This is part 11 in my series of DIY loft conversion videos where I show all aspects of my loft conversion from start to finish. In this video we are insulating between the rafters and fitting some breathable membrane in preparation for new slates. Hopefully you find these videos informative and enjoyable.
#loftconversion #tyveksupro #PIRboard #insulationboard
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For more loft conversion videos click here:
Loft conversion part 1 - Removing the insulation & lime mortar - • Loft conversion part 1...
Loft Conversion part 2 - Cutting and fitting the joists - • Loft Conversion Part 2...
Loft conversion part 3 - Building the block work wall - • Loft Conversion Part 3...
Loft Conversion part 4 - Fit more joists up to the block work - • Loft Conversion Part 4...
Loft Conversion part 5 - Insulation underboard & plyboard - • Loft Conversion Part 5...
Loft Conversion part 6 - Fit the perlin supports - • Loft Conversion Part 6...
Loft Conversion part 7 - Fit more joists and open the roof - • Loft Conversion Part 7...
Loft Conversion part 8 - Remove old rafters & construct the dormer cheeks - • Loft conversion Part 8...
Loft conversion part 9 - Ridge board, rafters and dormer construction - • Loft conversion Part 9...
Loft conversion part 10 - Velux frames, dormer cheeks, fit & level rafters - • Loft conversion part 1...
The Amazon links above are affiliate links. As an Amazon associate I earn from qualifying purchases.
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Thanks for watching!
Music Credits
Artist - Pouse Party
Song Name - Intro / Outro
Artist - The Elephant Rescue Plan
Song Name - And then she said
These are genuinely some of the best UA-cam videos I've seen. You, aside from being good at the actual craftsmanship, are a very good presenter! Thank you for these informative videos 😀
Thanks for the kind words, but I'm sure many would disagree with you! Thanks for watching.
You are not only a very good craftsman you also are great at explanation of what you are doing and why you are doing it.
Well I'm not sure about good craftsman but thanks for your kind words and thanks for watching.
Fantastic personally i think the best loft conversion videos on youtube cant wait for the next update.
Thanks for the kind words and thanks for watching.
I loved that tip about using a nail to hold the insulation down. Life saver 😘
My advice for insulating between irregular rafters, and joists for that matter comes from when I insulated the attic of my terraced house a few years ago. All the rafters were at different centres, some weren't running parallel to the rafter next to it, and others were bowed and twisted - a nightmare to insulate and get an air tight fit as you can imagine. My solution was to cut the board 20mm smaller than the opening between the rafters, wedge it in place either side with 10mm packers, and then seal the gaps with fire retardant expanding foam. Then, it was just a case of trimming it flush when it had gone off, and going over with silver tape making almost a solid piece of insulation. Another advantage of doing it like this is because the insulation is adhered to the rafters with the foam, there is no danger of the insulation becoming loose as the roof moves in hot and cold weather and it being lifted by the wind through the ventilation gap.
H Paul. Thanks for the tips. In later vids you will see me fit insulation, cutting it to right size then filling any small gaps with expanding foam and tape as you said. Thanks for watching!
Yes, it makes a change for you to bring something to the table.
Great progress. I love it when one of these videos pops up on my subscription.
Thanks for the feedback and thanks for watching.
Great explanation of each area of work, and then fast forward, really like this style. Great video and thanks for sharing 👍
Billy talent band sound like the music you play
m Mack true 👍
Thanks for the feedback and thanks again for watching.
Great progress, your not scared of hard work pouse.
Thanks for the feedback. Plenty left to do!
Excellent and informative video always enjoy watching your videos tanx for the upload.
Thanks for watching!
Amazing work Pouse's! Inspirational😅
excellent video as always.
Thanks for the feedback.
good progress all the best.
Thanks for the comment!
Well done boys
Thanks....but not finished yet! Thanks for watching.
Top job well explained thanks
just came across your channel, now binge watching, as i intend a similar project, one that that intrigues me is why yoiu never used a first fix nail gun, seems a lot of drilling and screws, asopposed to framing gun ?
I'm used to the rafters being covered either with plywood or sarking tiled a roof once where it was open rafters didn't enjoy it but scottish regs different from down south
Thanks for the feedback Gordon. A bit more mild down here so slightly different, and involves a lot more care when tip toeing across the roof! Thanks for watching.
I'm Planning to do my loft shortly These Videos are great just pricing materials did you use C16 or C24 joists
C24 as that was the strength required for my span. I had calcs done by a structural engineer. Best of luck with your project.
Can you use wool insulation instead of board ones on the roof?
Love the Videos! Just a quick question on roughly how much it costed you, i appreciate you did most of the work yourself, i am hoping to do as much as i can for a sparky!! 🙈 cheers
I think about 13K by the time it was all plastered but that included re-slating the whole roof, new soffits, fascias etc which isn't always part of a loft conversion. I just renewed it all while I was up there. Also materials are changing price a lot and I always look for a deal. But if you're in a rush and want to get on with it sometimes things cost a bit more. If you can afford it, there's a lot to be said for getting a team of people in and it's finished in 6 weeks!! I think if you're not adding any dormers and it's straight forward velux window type conversion then it's not too bad. Best of luck with it.
@@POUSEaroundtheHOUSE i appreciate youre Reply! Im at the stage of removing old lime mortar off rhe back of the slates and lath plaster lunps n bumps 🙈 i would like a full width dormer, do you know of a way i can install floor joists without removing the slates? Cheers
Ive tried to notice on the videos, is youre load bearing wall a stud? I have studs which are load bearing in that they are directly above a masonary wall and transfer weight, just not sure what building regs classifies studs as. Thanks 😊
On top of the celotex I need to put up the silver quilt to make it more warmer what thickness should I use it's in a dormer
If you're doing the project with building control approval to make it a habital room then they will tell you what they require and will inspect the work. Otherwise it's up to you. Thanks for watching.
great job how much is going to cost this kind of job
Thanks for the feedback. Not entirely sure of overall cost but it's looking like about a 3rd to a quarter of what it would have cost to pay a firm to do it. But, I have spent a lot of time doing it so a lot of the cost is labour. Thanks for watching.
Are you allowed to insulate between rafters in a standard loft with rockwool over the loft floor?
You can insulate between rafters but you need to leave an air gap between roof felt and the insulation board and add some ventilation like the fascia vents on my fascia boards. You can also put rock wool over the floor.
@@POUSEaroundtheHOUSE thanks for the reply mate.
We’re building regs/control ok with you screwing into the purlins?
Asking as this could save me a little much needed room
Yes, no issue with it. My purlins are huge. But always check as each house and project is completely different. Thanks for watching.
💪👍
What air-gap space do you need between the insulation board and the felt?
Depends on your project, but mine is with good quality breathable membrane and I need 25mm. Depends on your area, your membrane and your building control officer. Old bitumen felt is usually 50mm. Hope that helps, thanks for watching!
Hello bud, doing all the loft in my house now, done the PIR board from the inside. How much gap did you leave between then PIR and breathable membrane? I see 25-50mm everywhere to prevent condensation. Yours looks about 10-20mm on this video.
20mm in smallest places but 25mm or more depending on the state of the old rafters. If you use good fascia vents the air flow is amazing and shouldn't give you any problems. Thanks for watching.
Fantastic videos pal! Really informative 👏
Just wondering- you're not using the typical blue batton wood (what I've seen in other places) any reason for this? Not entirely sure on the difference, cheers
Oh and I've subscribed - well earned
Thanks for the sub!
They can be all sorts of colours, but the colours usually indicate a grade of timber suitable for the job. These ones aren't coloured but they are stamped with the appropriate grade required for roof battens, basically to meet British standards. Different shops, different colours sometimes. Thanks for watching.
Thought you had to have 50mm air gap between insulation and felt even if its a breathable felt?
25mm with breathable although always best to check with your local building control. I think it varies depending on area and officer. What I will say is now all my roof is done (I'm a year ahead of the videos) the air that blows through the downlight holes if no light is fitted in them is a hell of a lot, so the gap I left is more than ample for ventilation. Thanks for watching.
1st ... wicked
Thanks for watching!
Starting to look like a roof again, looks to complicated for me lol
It's too complicated for me but too late now! Thanks again for watching.
What thickness of insulation do you need between your rafters.
It depends on what U value is required for your loft. Once you know that figure from your building control officer then there are different ways to achieve that figure. You can use different types of insulation which offer different levels of insulating properties, and you can insulate below your rafters with thicker insulation if required, so it's not one answer sorry. You also have different regulations in different parts of the country, and the age of your property will determine how strict the requirements are. If you want to do a project like this, speak to your local building control officer as a starting point. Hope that helps and thanks for watching.
@@POUSEaroundtheHOUSE Hey mate, really enjoying these videos, I'm about to start building the dormer for mine so it's handy that you're a bit ahead. You're really lucky with your BCO, for a lathe and plaster ceiling here we have to have chicken wire wrapped in and out of the ceiling joists to hold the insulation up if the ceiling below burns away, and use stuff like the Rockwool RWA45 rather than the looser stuff you've been able to use. Horrible job doing the chicken wire!
@@paulrockliffe2378 in later videos you will see I use chicken wire in the main living area with 200mm insulation. I didn't find it too bad. I also plasterboarded below my lath when I renovated the house so I had essentially fire proofed the ceilings below but BCO said to chicken wire with insulation just to be sure. Hope that helps and hopefully you will see that in a later vid. Due to lack of time I am way behind with the vids than with the actually job. Thanks for the comment and thanks for watching.
@@POUSEaroundtheHOUSE Maybe your ceiling wasn't filled with a mix of loose-fill insulation and black ash filth, I was having 5 showers a day clearing up for the chicken wire! Glad to here BC are properly on top of you too, I don't think I would have needed the chicken wire if I'd plaster-boarded when I renovated, but I wasn't thinking far enough ahead at the time.
Never insulate the roof with the PIR pannels ONLY between rafters !!! The moist air inside will rush through the rafters and PIR pannels gaps. The wooden rafter will rot in some times due to moisture accomulation . Cover the rafter system over the entire roof area.
I actually insulated under rafters as well then in later videos you will see the whole loft is insulated between rafters, under rafters, all foamed in any air gas and aluminium tape over joints. Air gap between roof membrane and insulation as per building regs. Please watch all vids. Thanks for watching!
Why a breathable membrane/ felt?. Does that do away with the need for roof vents. Love the vids.
Kevin Cuthbert with traditional felts you need ventilation to stop the potential of condensation on the rear of the felt. Breathable felt allows water vapour to escape to the outside, so no vents.
@@gdfggggg If the membrane that Pouse has used is breathable, then why do building regs insist on a ventilation gap between felt and insulation? Is it just historical regulations, belt and braces or some other reason?
@@eastcardinal don't know if he's covered it yet, so without giving too much away he will use a ventilation system and that is why we have to leave that air gap between the felt and slates. Traditionally it would be a 2" air gap but he paid a fortune for some top of the range felt / sarkin that only requires 1" to keep more head room.
@@eastcardinal The ventilation space above the insulation allows the felt to sag slightly between the rafters instead of being tight up against the underside of the battens where any vapour or moisture can become trapped and rot the batten
Hi Kevin, the manufacturer of my felt suggest no ventilation is required. However local authority building control officers often request an air gap even with breathable felt but best to tak it through with your officer if you ever do a project like this. As you'll see in later vids I will use facia vents and I leave a 25mm air gap over my insulation. That way it eliminates the chance of any condensation build up. Thanks for watching!
Where is Part 12 ?
On the way! Thanks for watching.
Terrible camera angles Pouse. I need to get back on that diet 😳
Yes you do!
Putting insulation in is the most boring job of them all.
It's the worst part of any build involving insulation!
Slashley - Agreed, I hate it. In later videos you will see me doing it from the inside and I don't like it! Thanks for watching.