Insulated roof sheets for garage/workshop/man cave...

[Reiver]

Last night I spent a little while thinking about the best way to put together such a thing and came across these as a roofing solution not wanting to freeze my nuts off in winter:

https://www.steelroofsheets.co.uk/products/ks1000rw-composite-panels/

Not super cheap, but are super quick to fix and seem to be a neat way of getting insulation without losing too much vertical height  - I want to get a lift in there so normal fink trusses with ceiling + insulation aren't such a good idea, and insulating scissor or raised tie trusses looks like a PITA to me.

If the walls were blockwork/ICF what would be the best way to support said roofing panels I wonder - steelwork? or wooden raised tie + purlins?

I did consider an off-the-shelf steel frame building but I'm not sure how it would fit in aesthetics-wise with the house and hence PP - at least with "proper walls there's various options for finishing to sort of match the house.

 

[PeterW]

I'm thinking about 50mm PIR and using 3x2 on edge but I only have a 2.1m span and sandwich top and bottom with 11mm OSB - should be plenty strong enough. Then its a simple felt or EDPM job to waterproof it.

[Reiver]

Mine would need to be a bit wider than that, 5 or 6m wall to wall: looking at the info on those sheets it looks they would need supporting at least 1 point each side on a pitched roof.

[slab]

This is basically what I have planned but will be with metal framing and the purlin supports you can see in the pics from the link.

To stay under 2.5m height for permitted development and a 8m span, this is really the only solution that will work for me and give me clear internal space.

My problem is talking to my local BC, who must see plenty of commercial builds using these systems but dont seem able/want to translate that into residential use.

[Reiver]

7 hours ago, slab said:

My problem is talking to my local BC, who must see plenty of commercial builds using these systems but don't seem able/want to translate that into residential use.

That's odd, I can see some planners having a quick cough over the suggestion, but from the BC point of view as long as someone qualified has done the sums to make sure it won't fall in/blow off what's the problem??? And there are varieties now that are much better aesthetically than the typical industrial trapezoidal box section finish.

[slab]

I just get the impression from them that houses means bricks and metal buildings dont belong in housing estates.

The whole thing stinks of "jobs for the boys" it's why I tend not to involve 3rd parties with what i do, but this garage is going to be too large to deny.

 

For example if BC say no timber framing, to whom does one turn for a different/sensible ruling?

[joe90]

1 hour ago, slab said:

jobs for the boys

sometimes, my BC for my build was brilliant but I have come across “boys” in the past and had a fight on my hands (not as bad as planners tho ?). @Jeremy Harris had a timber framed garage as I remember and had no issues.

[Reiver]

Dunno really, I'm new to this self-build thing. But I thought the idea of BC was to make sure things got done properly and safely, regardless of the technology? If they're so narrow minded/out of date that only brick-and-block will do, then someone ought to be complaining big time, as it seems there's lots of other ways of doing things that can be more environmentally friendly/cost effective. Maybe you need to get a decent structural engineer on board to prove to them that it's safe/proper? Please let me know how you get on, 'coz I'm approaching this with an objective thinking-outside-the-box view and nigh on 40 years as a multi-disciplinary engineer/ materials specialist and I'm up for using anything that'll get the job done safely and solidly.

Edited June 29, 2020 by Reiver

[joe90]

@Reiver if your unlucky with your council BC what about going private (you don’t have to use council BC).Look for one that embraces modern tech, get googling fir your area.

[Reiver]

4 hours ago, joe90 said:

@Reiver if your unlucky with your council BC what about going private (you don’t have to use council BC).Look for one that embraces modern tech, get googling fir your area.

Cheers for the tip @joe90 , that could save a lot of headaches!