what size guttering do i need???

[sonofrob]

hello,,,ive been doing my house up which we recently bought,,,the guttering on the front of the property is 100mm and has two downcomer pipes at either end,,,months ago I noticed that one of the drains which takes one of the downcomer pipes is not a drain atall,,,all the water from this downcomer is going straight into the ground and not into a drain,,,i dug it out one day after noticing that one corner of the cellar was always damp and soon realised that there was no drain there,,,anyway what I plan to do is to put some larger guttering on and take it all to one downcomer,,,the one which feeds into a proper drain,,,what I wanted to know is what size guttering do I need,,,ive measured it up best I can here goes,,,distance from gutter to ridge is 5 mtrs,,,distance from ridge to attick floor is 2.7 mtrs,,,width of house from the side is 8 mtrs,,,width of house from the front is 16 mtrs,,,the pitch is 32 degrees,,,can anyone please tell what size guttering will do,,,would 150mm do the job I wonder,,,the only other thing I could do is put a new drain and pipe into the main drain but that will be big bucks,,,cheers......

 

[PrenticeBoyofDerry]

http://www.hunterplastics.co.uk/calculator/

 

[sonofrob]

on that hunters calculator is the width half the width of the house from the side??? like say my house is 8 metres wide from the side would the measurement they want be half of that or is the width the distance from gutter to ridge???

 

[mfarrow]

Look at Approved Document H of the Building Regulations. It will say what you need for your effective roof area in one of the tables.

Hunters want the width of the roof area being drained.

 

[Nige F]

on that hunters calculator is the width half the width of the house from the side??? like say my house is 8 metres wide from the side would the measurement they want be half of that ?

Yes, 4 metres

 

[^woody^]

Any typical house up to 8 bedrooms will be OK with 100mm gutters