Garage build

Author
Discussion

Lord Flashheart

3,516 posts

160 months

Monday 24th May
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This is exactly what I was hoping to do. Even buy an off the shelf oak framed building to self assemble. Sadly it won't be happening because the house is listed, in a conservation area and an AONB. Every hurdle you don't want, I have! Now our architect has drawn a single level double garage with bedroom/bathroom and a workshop all on one level. There is talk of piling, so I'd be keen to find out what you've been quoted for those?
Best of luck with it, I'll be watchimg.

GSDGPW

Original Poster:

38 posts

6 months

Monday 24th May
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After speaking to piling companies, figures of 30k were bandied about. I am reckoning on about 10-12k, this figure includes plant hire, muckaway, concrete,claymaster board and some labour. If the worst case scenario is 15k I’ll be happy with that.

GSDGPW

Original Poster:

38 posts

6 months

Tuesday 25th May
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Good news from the building inspector, well I guess in the scheme of things it is good news, we have finally come to an agreement that 2.5m depth all round is acceptable. It’s pushed up the concrete costs but if all goes to plan will still be considerably cheaper than piling. The JCB driver is a little worried due to the depth, my stress levels are through the roof. Roll on the day when we are out of the ground.
On a more positive note the site is now completely clear, all the old footings and floor slab were pulled up, two grab lorries took away all the masonry and concrete and I loaded my trusty old pickup and took two loads of guttering, tree roots and timber to our local tip.
An old oil drum was acquired, 5 minutes spent putting ventilation holes in it then a day spent burning all the old roof timbers and batten.
Digging trenches starts in earnest tomorrow. Reports to follow.

ollyprice87

262 posts

127 months

Tuesday 25th May
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So after the mucking about with the inspector and extra 100mm shut him up? Surely if you’re structural engineer said it’s ok then she’s qualified to make that call.

GSDGPW

Original Poster:

38 posts

6 months

Tuesday 25th May
quotequote all
It came down to NHBC guidelines I believe. The structural engineer worked it out according to a reasonable height conifer. The building inspector said we had to presume they were 20m maximum to allow for future growth. There is no way they would ever grow that tall, but I guess that actually he is correct. So the depth was worked out presuming that the conifers were massive.
100mm more isn’t the end of the world.
I’m trying to do everything exactly right, hence the borehole, structural engineer, and council building inspector.
The last thing I want is any problems further down the line.

MDMA .

6,508 posts

68 months

Tuesday 25th May
quotequote all
Al U said:
This looks about the same size as a bungalow I am about to buy to live in rather than store cars in frown
Go big or go home smile

AJLintern

3,960 posts

230 months

Tuesday 25th May
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Following with interest smile That's some pretty deep foundations - glad I got away with 1m trench fill for my garage!
What's the construction method? Conventional brick/block or timber frame...?

GSDGPW

Original Poster:

38 posts

6 months

Wednesday 26th May
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It’s going to be brick and block construction with 100mm insulated cavity. The accommodation up stairs will be timber with brickwork gables.

lrdisco

410 posts

54 months

Wednesday 26th May
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At 2.5m deep how will you bottom out the trenches?
What if a bit falls in? The JCB will not be able to reach.
I really hope you do not send someone or go down yourself.
You talk of doing it right but have you considered H&S at all?

You have said you will be using clay master, how will you install this without going in the trench?
If you or anyone go into the trench you are seriously putting lives at risk. I am not exaggerating.

GSDGPW

Original Poster:

38 posts

6 months

Wednesday 26th May
quotequote all
I totally agree with you, I have just retired after 30 years as a frontline firefighter so believe you me I take health and safety very very seriously. No one will be going down any trenches. The jcb has more than enough reach , and he has bought a toothless bucket for the final bottoming out. The claymaster boards are 2.4m long so can be put in from the top. If we do get collapses then it’s lots of shuttering and props. Fortunately my digger driver is an old school leave nothing to chance operator.
Your comments are appreciated and taken on board and I can assure you everybody on sites safety will be of the utmost importance.
Setting out this morning, then digging
Wish me luck

lrdisco

410 posts

54 months

Wednesday 26th May
quotequote all
GSDGPW said:
I totally agree with you, I have just retired after 30 years as a frontline firefighter so believe you me I take health and safety very very seriously. No one will be going down any trenches. The jcb has more than enough reach , and he has bought a toothless bucket for the final bottoming out. The claymaster boards are 2.4m long so can be put in from the top. If we do get collapses then it’s lots of shuttering and props. Fortunately my digger driver is an old school leave nothing to chance operator.
Your comments are appreciated and taken on board and I can assure you everybody on sites safety will be of the utmost importance.
Setting out this morning, then digging
Wish me luck
Great. I’ve seen lads down excavations this deep and no one cares until there’s a collapse.
Just a hint- Use really dry mix for the bottom meter to stop the clay master lifting when you pour the concrete.
If you use a wet mix you will find the clay master floats. Ask me how I know!

paulrockliffe

12,484 posts

194 months

Wednesday 26th May
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At that foundation depth, have you considered excavating that redundant lump of earth in the middle and adding a basement? It must be a relatively cheap option if you're already into massive foundations.

Fishlegs

2,142 posts

106 months

Wednesday 26th May
quotequote all
paulrockliffe said:
At that foundation depth, have you considered excavating that redundant lump of earth in the middle and adding a basement? It must be a relatively cheap option if you're already into massive foundations.
A compromise might be an inspection pit or 3.

AJLintern

3,960 posts

230 months

Wednesday 26th May
quotequote all
paulrockliffe said:
At that foundation depth, have you considered excavating that redundant lump of earth in the middle and adding a basement? It must be a relatively cheap option if you're already into massive foundations.
What he said ^^^ smile
I'd definitely be looking into it... (the big hole in the ground that is!)

Antony Moxey

6,027 posts

186 months

Wednesday 26th May
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Regarding a possible basement, would it be worth excavating and putting in the relevant structure/foundations for a basement to future proof the build? That way, at least at a later date it would be something that could be considered whereas if you don't put in the necessaries now it'll be nigh-on impossible later on. As said too, at least inspection pits could be considered with foundations/excavations that deep?

AJLintern

3,960 posts

230 months

Wednesday 26th May
quotequote all
Even if not a full basement, then something like this:


Escort3500

8,280 posts

112 months

Wednesday 26th May
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I do enjoy a good build thread; keep the updates and pics coming OP smile

Chainsaw Rebuild

1,538 posts

69 months

Wednesday 26th May
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lrdisco said:
Just a hint- Use really dry mix for the bottom meter to stop the clay master lifting when you pour the concrete.
If you use a wet mix you will find the clay master floats. Ask me how I know!
Years ago I worked on a site with footings and claymaster, we used metal rods (cut from reinforcement mesh I think) to "nail" the claymaster to the wall of the trench to stop if floating about.

rfisher

4,558 posts

250 months

Wednesday 26th May
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AJLintern said:
Even if not a full basement, then something like this:

Whatamdis?

Tell me more.

When I finally get my life sorted out (so never) I'll start a post about my triple garage with overhead accommodation build.

PP granted, building regs plans submitted, money in place, Brinno cameras saved in my Ebay watching list.

Builder is the current issue, plus, as OP has hinted, having a big build it isn't a calm and peaceful process.

For mine we would need to move out for a few months as there are also internal works.

Anyhow - tell me more about this basement lift thing.

We're currently planning on digging down to give around 3m ceiling height for a 4 post lift.

Leftfootwonder

1,083 posts

25 months

Wednesday 26th May
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Great stuff OP. Watching smile