timber frame conservatory roof with poly?

andy.m_2

I bought a used ebay conservatory, its been delivered and I'm delighted.

I am gong to use a block/render flank wall so the setting out is easy and I'm a Civil Engineer so happy enough with that also.

anyway, to my question:

Looking at the roof, it was a self supporting polycarb and has about 1100 components (Georgian), I was thinking about reusing the poly on a timber frame.
Which then got me to thinking that if I'm going to do this then it wouldn't be much more effort to suspend an MF ceiling at 8' to match the kitchen.

This would then assist with the summer heat and insulation above would also help with heat loss in the winter.

planners have said it's still a permitted development as long as the polycarb roof stays so is it really that easy?

existing lean to is being demolished and the end wall of the new (1.2m further from the house) will be blockwork down to an edge beam.

all help, ideas and constructive criticism welcomed

andy.m_2

ok, here's what I;ve pulled from Google and the planning portal...

Of course it's possible to have a timber framed/polycarbonate ceiling on my conservatory.
I would fit the dwarf wall, cill and PVCu windows as normal.
Then I would use timber as the eaves beam and support the roof as normal.
Fit a wall plate the origination kitchen wall and a simple 3m span for joists is no bother at all, nogged out at 400mm c/c would easily cope with a dryline ceiling and 150mm loft lagging over.
Make sure there is expansion and movement joints in each plane.
The ceiling would remain translucent and strictly speaking i am in breach of regs, but the planning officer (who I went to uni with!) said who would ever know.
Come to selling the house? rip down the plasterboard and leave the framework up there, chances are that the next user will only fit the same.

So as long as I maintain 75% translucent ceiling, 50% external façade glasswork, 3m max depth and under 4m ridge height I'm laughing.

Insulate under the floor, cavity insulate the dwarf wall, insulation over the ceiling and I could have a fairly usable room all year round.
There is GCH to that area already so just fit and inline stat to comply with regs.

The ceiling void is pitched to about 1m over at the highest so there is plenty of air circulation to prevent mould forming in the ceiling void, fit a small access hatch and possibly one of those solar powered fans/cowls to get fresh air in there from time to time.



Any criticisms to my plan?