Advice on leaky roof with shallow pitch

bonzodog2

An extension to a house has a leaky tiled roof. It has a very shallow pitch.
Front-back depth is 3.4m Width about 5.6m. Drop measured on inside is 20cm.

It would obviously be better with a bigger drop. Center window cill height prevents much of a change though. Owner has considered torch-on felt, but doesn't mind a cheaper solution; I suggested a couple of blocks of pitch melted and brushed over the slates


[apologies for pic width!]

comments or other suggestions please

Bonzo Delaney

bonzodog2 wrote: »

An extension to a house has a leaky tiled roof. It has a very shallow pitch.
Front-back depth is 3.4m Width about 5.6m. Drop measured on inside is 20cm.

It would obviously be better with a bigger drop. Center window cill height prevents much of a change though. Owner has considered torch-on felt, but doesn't mind a cheaper solution; I suggested a couple of blocks of pitch melted and brushed over the slates


[apologies for pic width!]

comments or other suggestions please

How is the velux not peeing in water with the back of the lower flashing I'd imagine lying backwards. Had a similar job to fix after a lad legged it on a sunroom with to low a pitch installed. Nightmare to modify the lower flashing to suit. Still not overly confident with it. The next step would be to raise the velux on a curb and lead flash it.
With the roof itself I'd strip the tiles and put the roof tile sheet on the velux woud still be an issue I'd imagine. Either that or strip the tiles, osb3 the roof and fiber glass it.
The roof could of been raised to the level of the other sills with a gable either side of the lower window and something like a shallow sloped area out to the eaves done in lead, torch on or fiberglass. At the low window. Incorporating the velux on a curb.

Sorry just had a closer look at the picture and realised it's slates on the roof not tiles.
Which are a bit more forgiving on a low pitch roof. There's hardly a few cracked slates on it and because it's on such a low pitch the slate hasn't " fallen" down enough to notice.

Bonzo Delaney

Also the sewer T junction fitting in the top left needs to be turned the other way towards the fall and the bracket to the left of it droped an inch or two. Also an extra bracket or two wouldn't go amiss further on up the line under the 90 degree fitting in the top right

But that's probably on the list anyway.

rolliepoley

Strip the roof, run some Firring pieces along the joists to raise the fall then deck it and felt it.

650gs

Raise the roof at the rear by putting in a vally

bonzodog2

I enquired today at a builder's merchant about blocks of pitch, they said they hadn't seen it in years. Any suggestions where to source? I know it wouldn't be a 100% great repair, but if it needed doing again in a few years but was cheap it might suit.

650gs

Waste of time

whizbang

strip the tiles, osb3 the roof and fiber glass it.

+

but i would consider loosing the velux, or incorporate the velux into the smaller window space

cork2

whizbang wrote: »

+

but i would consider loosing the velux, or incorporate the velux into the smaller window space

I agree but I'm presuming this won't happen as the OP uses the word "cheap". Op forget about your block of pitch that'll last a year or two. In my opinion the roof you currently have is a waste of time the options are

Strip the whole roof, create a valley to the rear of the ridge and thus raising the pitch and re slate it.

Strip the slates and put osb in the roof and either torch it of fibre glass it.

Rubbing on temporary quick fixes is money down the pan and a waste of time.

bonzodog2

Thanks for your opinions and suggestions