Anyone built a SIPS garage?

[4Q]

I built a garage from sips and would do it again. Reasonable cost, quick and easy to go up, nice and warm and dry with no condensation. I clad the outside with cedral cement boards and left the inside bare osb. Including concrete slab it cost me around £2k.

[V8RX7]

4Q said:

I built a garage from sips and would do it again. Reasonable cost, quick and easy to go up, nice and warm and dry with no condensation. I clad the outside with cedral cement boards and left the inside bare osb. Including concrete slab it cost me around £2k.

I'd love to see the price breakdown for that

[Equus]

martin-g2gm3 said:

interesting,
Even so this seems a lot cheaper than £40k plus quoted earlier?

The £47K plus referred to above was, as I said before, certainly not a cheap quote.

But I assume it was for a turn-key build, with with presumably decent quality materials (Marley roof tiles were mentioned, and it's fair to assume decent doors - which can be a 4-figure sum each - not £400 budget roller shutters.

And it was for a garage twice the size of the one you're suggesting.

Your prices include no labour, are missing quite a few items (electrics, drainage, facias and soffits, breather membrane and battens; plasterboard and battens; your price for the roof seems very light; have you allowed for all the corner trims etc. with the cedral; does the base allows for a brick/block upstand with DPC to lift the SIPs 150mm, above adjacent ground, etc?), and you're still totalling close to £10K in basic materials.

One further point with SIPs:

Timber garages last reasonably well because they are very breathable, therefore any moisture that gets trapped in them can disperse easily.

One of the 'advantages' of SIPs when used to build a house is that it's very airtight, and the OSB skins have sufficient vapour resistance on their own that you don't even need a vapour barrier except in wet rooms. On an unheated garage, that's potentially a problem rather than an advantage.

I stick to my original response that I think you need a coherent reason to build in SIPs rather than more traditional techniques, for a garage, and apart from speed and convenience of initial build, I'm struggling to see one.

[TA14]

martin-g2gm3 said:

interesting,
I'm about to start a garage build in sips. 6x5.5m
So far the costs are as follows.
Base. £1500
Panels £2400.
Door £ 800. ( Roller shutter X 2)
Personal door and window £1250.
Cedral exterior cladding £2000.

Haven't decided on the roof yet. Either fake slate or fiberglass.( Not costed but estimate £1500.)
Interior will be clad in plasterboard for fire resistance ( not costed yet) plus electrics etc.

Even so this seems a lot cheaper than £40k plus quoted earlier?

Your costs add up to about £12K. If you add in a bit for the items that crop up along the way that you've forgotten about and a contingency to allow for real prices higher than you expected you might get north of £20K. Your garage is about half the area of the £40K+ garage and some of your material/component choices seem to be cheaper. All in, both garages seem to be of a similar cost per unit area.

[JuanCarlosFandango]

I've been through this recently with the extension I'm building. SIPS are appealing because you can see the walls going up and think "I could do that in a day!"

What they don't show is the groundworks which is where a lot of the mess and hidden cost lies. Don't compare SIPS with a masonry building, compare them with a pallet of blocks.

Also worth mentioning that if you're not keen on mess, noise and disruption knocking down a brick garage is has plenty of all.

On the face of it you could do a lot better keeping the existing structure and insulating it. Kingspan/celotex all over the walls can be covered with plasterboard or OSB inside, fibreglass or another skin outside depending on space and cost considerations.

75mm kingspan on the walls with a new, insulated roof will already make this garage more weatherproof than a lot of (most?) houses.

What is the current floor?

[martin-g2gm3]

V8RX7 said:

4Q said:

I built a garage from sips and would do it again. Reasonable cost, quick and easy to go up, nice and warm and dry with no condensation. I clad the outside with cedral cement boards and left the inside bare osb. Including concrete slab it cost me around £2k.

I'd love to see the price breakdown for that

[martin-g2gm3]

V8RX7 said:

4Q said:

I built a garage from sips and would do it again. Reasonable cost, quick and easy to go up, nice and warm and dry with no condensation. I clad the outside with cedral cement boards and left the inside bare osb. Including concrete slab it cost me around £2k.

I'd love to see the price breakdown for that

What roof did you choose?

[martin-g2gm3]

TA14 said:

martin-g2gm3 said:

interesting,
I'm about to start a garage build in sips. 6x5.5m
So far the costs are as follows.
Base. £1500
Panels £2400.
Door £ 800. ( Roller shutter X 2)
Personal door and window £1250.
Cedral exterior cladding £2000.

Haven't decided on the roof yet. Either fake slate or fiberglass.( Not costed but estimate £1500.)
Interior will be clad in plasterboard for fire resistance ( not costed yet) plus electrics etc.

Even so this seems a lot cheaper than £40k plus quoted earlier?

Your costs add up to about £12K. If you add in a bit for the items that crop up along the way that you've forgotten about and a contingency to allow for real prices higher than you expected you might get north of £20K. Your garage is about half the area of the £40K+ garage and some of your material/component choices seem to be cheaper. All in, both garages seem to be of a similar cost per unit area.

That may be true. I have thought about timber framing but I understand that sips are structurally stronger and will allow me to have a cathedral style roof to allow a vehicle to be lifted. I need to keep the eaves and roof height low for planning. So,all in all, I guess it depends on your needs.

[Equus]

martin-g2gm3 said:

I have thought about timber framing but I understand that sips are structurally stronger and will allow me to have a cathedral style roof to allow a vehicle to be lifted.

You understand wrong. SIPs are no stronger than masonry or timber frame walls when it comes to resisting the eaves thrust of a vaulted roof.

[Harry Flashman]

Following this thread as well, as I may take the tips for my garden room project...

[Donald M]

I to am planning a 6m x 6m garage. Originally my son, a self employed fabricator was going to build a steel frame which we would clad with wood but its too much to ask even of my son so we decided to construct it from wood. The only criteria is that it protect 2 cars frost free for long periods, from the ravages of the Scottish weather.

A traditional stick built insulated garage built with 100mm stud walls constructed on site with 25mm hard insulation and wooden cladding, taking the walls to 130mm. Roof was going to be Trusses with 40mm composite insulated steel or 9mm osb with slates and rock wool over a plaster boarded ceiling.

Using a single 4m insulated roller door with either choice.

Now thinking about using Sip's panels 100mm on walls and roof and either steel or slates?

Roughly costed and Sips appear to be slightly dearer but when you add in the labour costs the Sip's seem to have it due to speed of construction.
I hear what you are saying about ventilation and I think I can achieve that by ventilating the ridge of the apex roof.

I would love to know how you all decided to build you garages and your thoughts you have about my plans?

[KTMsm]

Donald M said:

I to am planning a 6m x 6m garage. Originally my son, a self employed fabricator was going to build a steel frame which we would clad with wood but its too much to ask even of my son so we decided to construct it from wood. The only criteria is that it protect 2 cars frost free for long periods, from the ravages of the Scottish weather.

A traditional stick built insulated garage built with 100mm stud walls constructed on site with 25mm hard insulation and wooden cladding, taking the walls to 130mm. Roof was going to be Trusses with 40mm composite insulated steel or 9mm osb with slates and rock wool over a plaster boarded ceiling.

Using a single 4m insulated roller door with either choice.

Now thinking about using Sip's panels 100mm on walls and roof and either steel or slates?

Roughly costed and Sips appear to be slightly dearer but when you add in the labour costs the Sip's seem to have it due to speed of construction.
I hear what you are saying about ventilation and I think I can achieve that by ventilating the ridge of the apex roof.

I would love to know how you all decided to build you garages and your thoughts you have about my plans?

Unless it's heated, I'm struggling with why it's insulated (other than a steel roof, that needs to be insulated to avoid condensation)

I'm unsure what 9mm OSB is for

All the insulated aluminium roller doors I've seen are effectively a massive aluminium radiator their design (for insulation purposes) is deeply flawed most have terrible security too