Ive got a leak

[bearC]

Hi all . I have a leak in the roof for my extension. It's not every time it rains , and it's only done it twice since November/December. Damp patches are only visible in 2 areas one in a top corner of the hole for the velux . And another toward the bottom of the roof where a profile is for a L.E.D strip. Any suggestion on how to locate where water is getting in?

2 pics included. the red is roughly where the 2nd damp patch usually is. Its dried since seing it this morning

 

[bearC]

I'll try a get a picture of the outside the the velux in the morning.

Also is there a way of taking the window out so I can check if there is anything blocking the water from draining properly

 

[noseall]

I'll try a get a picture of the outside the the velux in the morning.

Also is there a way of taking the window out so I can check if there is anything blocking the water from draining properly

You'll need to photo all the way up to the abutment. The Velux is interrupting the water, so it may be a leak further up. We make a rain deflector at the top of our roof windows in the event of a leak above.

EDIT: is yours a flattie with a curb upstand?

 

[bearC]

The velux is flat on the roof. Any pics of your rain deflector? It's bizarre it's doesn't do it every time it rains. It's rained plenty of times since we've been here but only seen this twice.

To dark to get a picture this morning unfortunately

 

[noseall]

The velux is flat on the roof. Any pics of your rain deflector?

Pitched roofs only.
It's merely a way of arranging to roofing felt so that any roof leaks above the Velux are deflected to the sides or onto the Velux top flashing tray.

 

[noseall]

It's bizarre it's doesn't do it every time it rains. It's rained plenty of times since we've been here but only seen this twice.

Is it to do with snow build-up?

 

[bearC]

Is it to do with snow build-up?

No snow in the south yet . There wasn't anything during the storm in December. But the first time we saw the wet patches was about 3days before the storm

 

[Harry Bloomfield]

Also is there a way of taking the window out so I can check if there is anything blocking the water from draining properly

If the Velux is the usual tilt and turn type, which can be rotated almost 180 degrees, then there are catches at either side of the hinge mechanism, to release it and allow window and frame to be released, and removed. The catches, are like a peg, which simply tap level with the hinge, to release. Basically - rotate the window 180 degrees, then using a small hammer, tap the pins at each side. Window can then be slid off the hinges, but they are very heavy, it will need two strong people.

Refitting, is a matter of engaging both sides, back in the hinges, then rotating back to closed position. The pins automatically return to their default locked position.

 

[noseall]

If the Velux is the usual tilt and turn type, which can be rotated almost 180 degrees, then there are catches at either side of the hinge mechanism, to release it and allow window and frame to be released, and removed.

The 'sash' can be removed - not the frame!

There is not much to be gained by removing the sash.

 

[Harry Bloomfield]

There is not much to be gained by removing the sash.

Full access to the roof, around the opening, to investigate the source of the leak?

 

[noseall]

Full access to the roof, around the opening, to investigate the source of the leak?

Yeah, but it's a flattie, so better to go up the outside. Last thing you want is to be doing is wrestling a large sash off steps.

 

[bearC]

Last thing I want is to go on the roof . I'm not the lightest person. I was hoping to pop my head out the velux. It's flat on the roof but not a flat roof it a lean too but 4m long and 3.8m wide

 

[bearC]

**** dark picture but tye best can do at tye moment. Does show some moss build up

 

[noseall]

Last thing I want is to go on the roof . I'm not the lightest person. I was hoping to pop my head out the velux.

Is the Velux top hung or centre pivot?

 

[bearC]

Top of think . Sorry not helpfull I only opened it once since living here