Plans for a porch.

[toptec]

I am planning on replacing my side porch soon, once the weather improves. It is there purely as a secondary weather buffer, there will be no heating, insulation or light.

This what is currently there....

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This plastic one is leaking on all three sides. I want to keep the current footprint of 2.25m2. the current slab is 150mm and is good nick.

Forgive the carp scaling but this is what I am thinking of....

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The dwarf wall will be 12 courses single skin, matching the existing side wall, on a dpm, tied properly into the main wall.

The thick black lines will be timber studding/noggins, which I want to clad with wood. Fixed with coach bolts to the main wall. This will support a 18 mm WPB pitched roof covered in lightweight shingles and underlay. Bulk standard wood windows in each side wall.

The roof will match existing fall of main roof and will be 2.8m high. It will be properly protected with lead flashing.

Well that's the plan. Sound feasible? I know I am fine with the planning and building regs. Bit unsure about the depth of founds.

 

[AndrewSchofield]

Toptec, can't comment on your foundation query but on a design point, are you sure about the dual-pitch roof? It may look a bit odd up against the side of your house when built and it means constructing some form of valley gutter between the roof and the house which is going to be prone to problems and need clearing out from time to time. Wouldn't a 'lean-to' be better and easier? Unless you're restricted for height by a first floor window maybe?

Just my opition - design is subjective!

 

[toptec]

Hmmmm. Good Point AS. Why would I need a valley though? I thought I could just flash where the two pitches meet the side of the bungalow.

A lean to design would work but I thought a pitched roof would match better. Albeit about 2 feet off centre of the main roof ridge.

 

[^woody^]

Your sketch does not make it clear there the main bungalow wall is.
Looks like you have a gable end there, in which case a similar gable and pitch roof to the porch would match nicely.

Minimum 600mm is generally enough for foundation depth, but it depends on the ground

 

[noseall]

i agree with woods regards mimicking the pitch of the existing roof, good advice.

seems like a lot of wood though. maintenance.

there will be no valley, only an abutment flashing, with soakers if necessary.

 

[toptec]

Cheers chaps. I agree that the pitch roof is the best astetecally. I can put up with the maintenance, little bit of rubbing down and renewing.

The flashing I am happy with.... but "Soakers" Noseall? Pray tell.

What be them then?

 

[noseall]

soakers are predominantly used with plain tiles and are there to supplement the stepped cover flashing. these tiles are flat and require a 90 degree soaker to deal with water that may want to wander in at the wall abutment.

in some instances a concrete interlocking tile can benefit from a soaker too. only those that are flat in profile and have been cut to fit to a wall abutment.

flat as in marley moderns or cut wessex.

 

[AndrewSchofield]

Hmmmm. Good Point AS. Why would I need a valley though? I thought I could just flash where the two pitches meet the side of the bungalow.

I think i've misunderstood your sketch, i was thinking the long side of the porch (on your sketch) would abut the house but reading on i now see you meant for the pitched roof to run at 90deg. to the wall. No valley gutter and yes, in this oreintation i agree the dual-pitch will look better.