Single storey extension flat roof height

[tomfe]

You'd have to counter baton the joists, but yes.

 

[Brickymatt]

What do you mean by counter batten , I'm not good with roofing I am more groundwork biased

 

[tomfe]

if you had pipes in they would only vent one joist space, do you'd have to add batons going at 90 degrees to the joists to vent the whole roof void.

 

[^woody^]

I know it should be vented back to front ideally but would a few pipe type vents on the roof do the job ?

It would be continuously vented via the upstand, beneath the lead flashing.

 

[noseall]

.....or just change that window.

 

[Brickymatt]

Do you hate my window ? Lol it lets a nice bit of light to the hallway and stairwell

 

[bobsuerita]

they do a vent thats goes behind lead flashing to vent front to back how good they i dont know but think you would struggle under window

 

[noseall]

Do you hate my window ? Lol it lets a nice bit of light to the hallway and stairwell

Not really no. The ease of replacing that window and making good the sill etc would be a synch compared to the other suggested faffs.
And you will still have a window, but one with a higher sill.

 

[rssteve]

You should also have a 150mm upstand. Plus a ventilated upstand would add an additional min 25mm to the upstand height. And with a cold roof you would probably need some insulation below the joists. Probably less than 50 mm between a cold and warm roof thickness.

Could you run a gutter along house and slope the roof towards it.

 

[Brickymatt]

Sloping the roof towards the house ? I thought that would cause more problems than my bloody window

 

[catlad]

You are asking for advice and several experienced people have told you
that you need to change your window for a smaller one, preferably an escape window.
Don't forget your skylights.

 

[Brickymatt]

Yes the message is getting thru i will probably change the window for one with 300mm less height that will give me plenty of space for a warm roof
Thanks all