Advice on insulation under new flat rubber roof please :) pics added

[sean oc]

Even taking the lowest loading in Euro code 5 (TRADA) the max span is 1.75! Fixing a 145 x 47 alongside will be OK.

Okay great

I am okay at DIY etc but got the roofers in as expected them to atleast check the basics.. typcial.
I will be able to fit the joist hanger and fit some 145X47 next to them,

The last thing i want is to plasterboard it all and skim it for it to sag

Thanks for the help

 

[frutbunn]

Too lean by at least two increments - i.e. should have been 6" instead of 4".

I hope that slender pier on the right, is not going to be doing all the work of holding up the roof and resisting racking and restraint, surely?

That's why I pointed out about B Regs. Theres no verical DPC, insulation etc.

 

[noseall]

I am after advice on how insulating the roof before i plaster board the ceiling

Surely your roofers are fitting a warm deck?

 

[noseall]

Theres no verical DPC, insulation etc.

...or strength.

 

[sean oc]

Not a clue, i have left it to the so called 'roofers' which doesn't seem the best idea after the comments here, I did have about 4 roofers look and they all said the same design would be fine so i though fair enough. i was always sceptical as a roof is heavy

Would i best adding brick piers in-between the two windows on each side and getting new upvc windows each side of a pier? to help with support?

 

[Notch7]

The work require B Regs, the existing building is an exempt building however, by virtue of the work being carried out it is a material change of use and now requires an app.
Regardless of B regs any reputable Co would have realised the joists are pretty useless.

I don't that applies since the definition of a conservatory was removed from the building regs a few years back.

Provided it is thermally seperate, it is still an exempt structure.

 

[frutbunn]

Not a clue, i have left it to the so called 'roofers' which doesn't seem the best idea after the comments here, I did have about 4 roofers look and they all said the same design would be fine so i though fair enough. i was always sceptical as a roof is heavy

Would i best adding brick piers in-between the two windows on each side and getting new upvc windows each side of a pier? to help with support?

I don't that applies since the definition of a conservatory was removed from the building regs a few years back.

Provided it is thermally seperate, it is still an exempt structure.

I think you will find most LA's will only accept a conservatory as being exempt if it has a translucent or clear roof, default to dictionary if no other guidance in B Regs.

 

[Notch7]

The one brick pier was not necessary, a SHS would've done the job, even a timber post.

Lateral restraint isn't necessarily required as the conservatory is braced against 2 other buildings -a 1 brick pier won't add any lateral restraint anyway.

 

[noseall]

i was always sceptical as a roof is heavy

It's nothing really to do with weight of the roof although it is an additional factor. Its more to do with snow and wind loading and the roofs ability to resist diaphragming etc. Couple a bouncy unstable roof with a slender pier and you will have some fun.

Would i best adding brick piers in-between the two windows on each side and getting new upvc windows each side of a pier? to help with support?

Just a reference, the standard cast-in-stone requirement for external corner returns is three bricks minimum.

 

[sean oc]

Interesting

not sure how to move forward this now, whether to fix 145x45 to stop sagging and then see how it works out? im out ££ really so cant go making major changes at the moment to it.

 

[sean oc]

Is it worth trying to take to the roofer now? he has been paid half as i presumed it was all good to go.

all the boards and rubber is stuck down now

 

[Notch7]

I think you will find most LA's will only accept a conservatory as being exempt if it has a translucent or clear roof, default to dictionary if no other guidance in B Regs.

Its a grey area. I agree a totally solid roof on a conservatory makes it subject to B regs in theory, but clearly the LA aren't interested as there are now thousands of companies offering solid roof conversions.

It's academic anyway since it's unlikely a conservatory structure could be made compliant....it certainly wouldn't be worth the aggravation.

LAs will accept orangeries, even with small lanterns to be exempt. So you don't need a full clear roof at all.

 

[Notch7]

Interesting

not sure how to move forward this now, whether to fix 145x45 to stop sagging and then see how it works out? im out ££ really so cant go making major changes at the moment to it.

If you have space height wise I would sister the existing joists with 6 x 2.

I'm not sure there is a suitable plate above the frames to support the joists.

 

[sean oc]

If you have space height wise I would sister the existing joists with 6 x 2.

I'm not sure there is a suitable plate above the frames to support the joists.

Should have space yeah, not sure whether to pull the roofers and ask them to swap them to sister them up as i have a 2nd opinion on it. problem is he's have about 60% of the cash now

 

[sean oc]

Spoke to roofer, he said they didn't used 6x2 as trying to keep weight down as most of the wall is windows and will be using noggins to secure the current joists to together