Week 8 - And pause... or not.
Entry posted by Benpointer in General
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Last week our timber frame structure shot up. This week was supposed to be the second week of a two-week frame installation but the team finished on Tuesday, having worked through the weekend. And off they went, but not before I persuaded them to stand still for 30 seconds for a snap for posterity. So here they are: Brandon, Jake and Callum - Great work guys!
Their early finish allowed our chippie Alan to press on with the 18mm ply required over the roof for the zinc roofing. 60+ sheets of 18mm class-3 exterior ply were put up amazingly quickly by Alan with a bit of assistance from his pals on a couple of days.
The only lifting gear on site at present is a Genie lift we bought, guessing it would come in useful, and Alan made great use of it to create a novel “Ply Sheet Lift 'n' Slide Sledge”.
I pointed out to him that I’ll be patenting that idea, since all intellectual property rights obviously sit with us as site owners. He seemed unbothered.
Next week Alan is away on hols (not in my plan, are you sure Alan?!). Thus we were going to have a quiet week which I labelled ‘contingency’ to make it sound more important.
But Brian from Wessex Metal Roofing phoned me today (yep, Sunday) and asked if they can start the zinc roof a week early... “Oh, go on then.” So off we go again - more fridge-stocking required!
Timber frame details
Last week I promised to say some more about the frame structure, so at the risk of boring those not wrestling with the same choices we faced,t here’s some more detail (skip to the 'And finally...' section if you’re not interested):
We decided early on that we wanted a factory-built SIPS or insulated Timber Frame structure. We’d used SIPS on our previous house with positive results. I contacted a dozen or so companies and received quotes from eight companies for supply and installation of the insulated structure: four SIPS companies and four Timber Frame. The price range was surprising: the most expensive was 240% the price of the cheapest. Of course each quote had a slightly different scope but factoring in the work we’d need to do to get them all to the same level of insulation and airtightness, the price range was still over 200%.
In the end, shortlisted Turner Timber Frames, whose price was near the lower end but leaving us with a fair bit to do once the structure was up, and MBC who unsurprisingly were at the top end for an impressive approach and structure. After talking it through with Geoff our architect, he agreed with us that the price difference was so big it was hard to justify the MBC approach. Therefore we opted for Turners… And they have been really great to work with throughout.
Matt, their Timber Frame Manager, has been very helpful and responsive. Their price has not gone up at all as we moved from initial quote through to signed-off design (in fact they came in below their initial estimates for steels and crane hire). They kept to the agreed timescales. Their sub-contracted installation team were really good, as previously noted. The quality of the frame appears very good to my untrained eye… and Alan our chippie seems impressed as well.
The structure we bought is Turner’s Super Advanced timber frame: 140 × 38mm studs at 600mm centres with 9mm OSB sheathing and a breather membrane on the outside. The pre-fitted insulation is 120mm PIR and it fits really precisely everywhere. We opted for an additional 50mm PIR inside to give us a wall u-value of 0.13, recognising that in so doing that we had to fit the VCL, 50mm PIR, and 25mm service cavity battens ourselves (though all are supplied by Turners as part of the package). Some other frame or SIPS suppliers do all that for you, but at a cost.
What you see in the pictures is the frame before we fit the VCL and additional insulation - I think you can see how tight that pre-fitted insulation is - it’s really very snug all round. I was worried we might have gaps to fill but there are none.
The roof is open-web 254mm Easi-joist rafters with 11mm OSB, which we paid Turners an agreed addition to have their installation team cover with breather membrane and vertical 50mm battens to create the ventilation space we need for our zinc roof. Turner’s approach means we have no unsightly purlins to interfere with our vaulted ceilings. But the roof does present a challenge for insulation. We decided to opt for blown cellulose within the roof space which should fill the open web joists, plus 100mm PIR below the ceiling, to get to a u=-value of 0.09. It meant we had to find someone to fit the VCL below rafters and make it airtight (see below).
We also have to fill in all the roof perimeter gaps to stop the cellulose blowing out, and we have volunteered Alan for that. He’s delighted (I assume).
We always knew the blown cellulose was going to cost a fair bit. J W Insulation from Halstead in Essex came in with a good price and are lined up to do the work w/c 4th August. Before that we need the VCL membrane fixed the roof. In the end we decided that a specialist company would be best for fitting the ceiling VCL, the airtight wall membranes, and additional internal insulation. We have South West Insulating from Redruth coming along from 28th July to do that work.
So we have a busy few weeks ahead - I am hoping all that activity meshes together and the various teams don’t get in each other’s way (and the drinks fridge is big enough!).
And finally (for this week)…
Frustratingly, despite the frame being up for a week now, as a wheelchair user with a 300mm high perimeter foundation wall to get over I have not been able to see inside.
Until today…
Although I promised Mrs P. that this build would involve no heavy lifting or lugging on our (i.e. her) part, today she has been heroically moving pallets, ply sheets, and 4m scaffold boards into place, which we have screwed together make a wheelchair ramp! So today for the first time we could both enjoy the shape of our new house from inside.
And we love it!
It's impossible to capture in photos but we are both really pleased with how it feels, the room sizes, the vaulted ceilings, the overall layout… everything. Which is just as well really as it’s a bit late to change the design now 🙂
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