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Garage conversion/workshop fit out

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Re: Garage conversion/workshop fit out

Postby Mike G » 03 Feb 2022, 09:53

You don't have to comply with building regs on this (and you couldn't achieve compliance with an unventilated cold roof anyway). In the absence of re-building the roof or lowering the RSJ I think getting the best air-flow you can achieve is going to be your best bet. Regs call for the equivalent of a continuous 1" gap, which means if the joists are on 400 centres, for instance, a 100mm diameter hole provides approx the same open area. Obviously some of that would be obstructed by your insulation, but it does show the sort of ball park you might aim for..... maybe a bit less than you might think. I would include a vapour barrier in your ceiling, in addition to lining it with OSB or ply.
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Re: Garage conversion/workshop fit out

Postby samhay » 03 Feb 2022, 13:04

No expectation this will comply with building regs, but figure I should do the best I can.
1" gap is smaller than I expected. Most of the gaps above the RSJ will be at least this big and I suppose I could drill a few holes in the joists to help circulate air in those where the gap is smaller?
I'm not sure how much fun drilling a couple dozen 100mm holes up a ladder will be, but that feels slightly better than drilling 100-odd 50mm holes. I'll experiment on one of the blocks that was left over.
There will definitely be a vapour barrier in the ceiling.
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Re: Garage conversion/workshop fit out

Postby Deejay » 03 Feb 2022, 13:31

Morning Sam

I'm not sure how much fun drilling a couple dozen 100mm holes up a ladder will be


This will give you an idea

https://www.youtube.com/watch?v=EMl7Q4Q7nI0&t=13s

Edit
Sorry Sam, wrong end of the stick. :oops:

I thought you wanted to establish an airflow between (parallel to) the joists

Cheers

Dave
Last edited by Deejay on 03 Feb 2022, 15:31, edited 1 time in total.
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Re: Garage conversion/workshop fit out

Postby Cabinetman » 03 Feb 2022, 14:25

If I have been following this correctly, rather than trying to drill 4 inch holes through the top blocks it might be easier to chop them out and work on them on the ground, I bet there won’t be much resistance especially as they are only mortered on three sides, and rather than drilling you could just cut the blocks with a stihl saw to give you gaps rather than holes, Ian
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Re: Garage conversion/workshop fit out

Postby samhay » 03 Feb 2022, 17:41

I need to take a closer look, but the blocks seem to be mortared on all 4 sides - bottom to the wall below, sides to the joists, and top to the roof deck.
If they can be knocked out without too much bother, and without damaging anything else, that would be great. I assume they are just there to act as spacers for the joists, so I should be able to replace them with noggins. I'm not sure they will come out without a fight though.
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Re: Garage conversion/workshop fit out

Postby RogerS » 03 Feb 2022, 18:06

Mortar to wood usually has minimal adhesion/strength/don'twannamove. Mortar between bricks/slabs can be ground out either with a general purpose blade in an angle grinder or a more specialised blade like this one...

mortar blade.png
(1.74 MiB)


although depth of cut might be an issue if you can't get through to the other side.

Or use a sledgehammer. Get a workout at the same time :eusa-dance:
If opportunity doesn't knock, build a door.
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Re: Garage conversion/workshop fit out

Postby samhay » 03 Feb 2022, 18:28

Thanks Roger. I will be removing the fascia, so will have access from both sides.
I assume those go in an angle grinder? If so, I'm not sure I fancy trying that option as access will make it awkward.
I'll give one a wack with a small sledge hammer to see how likely they are to pop out.
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Re: Garage conversion/workshop fit out

Postby RogerS » 03 Feb 2022, 18:30

Do you want to re-use them ? If not then a sledgehammer will sort them. Or hire a breaker or even an SDS drill with hammer attachment (a chunky one, mind). Will depend on how hard the mortar is.

That blade I showed is for the smaller size angle grinder. But you can aso use it for pre-cutting the joints as and wherever you can prior to sledgehammering. It is a very cathartic exercise provided you imagine all your annoyances and annoying people are the wall.
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Re: Garage conversion/workshop fit out

Postby samhay » 03 Feb 2022, 18:49

I don't want to reuse the blocks, but I do want to get them out (or drill holes through them) without destroying the existing roof.
Was too windy for much last weekend. Hopefully this coming one will allow a bit more of a play.
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