Run water over the low side of the penetration for several minutes while the helper watches for any water droplets.
How to fix a leaking slate roof.
Inspect the roof from outside.
If you don t want to wait for rain to look for the leak try bringing the garden hose up on the roof.
Isolate areas when you run the hose.
Have a helper stationed in the attic with a flashlight looking for moisture.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Be sure to start small.
Run the water over the place where you think the leak might be located.
A new slate or salvaged slate which should match the size shape texture and weathered color of the old slate is then slid into place and held in position by one nail inserted through the vertical joint between the slates in the course above and approximately one inch below the tail of the slate two courses above.
Insert a nail in the hole where water is leaking through the roof.
Unfortunately because the valley has to extend back up under slates on either side of the valley itself to make the best and proper and most durable leaky valley repair one has to remove slates to replace or re line a leaky slate roof valley.
Use enough water to mimic heavy rains.
Start low soaking the area just above where the leak appears in the house.
The nail will provide a path for the water.
Seal the leaking point with tar to achieve the desired when sealing the leak you must wait until the leaking.
Don t go crazy with the water.
For example soak the downhill side of a chimney first then each side then the top on both sides.
You can use either a dry bonding gutter or the standard bonding gutter.
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Step 2 place a bucket underneath the nail to catch the water as it runs down the nail.
Begin soaking low on the roof just above where the leak is visible inside the house.
Look for the leak the first thing to do when you attempt to fix your leaking roof from the inside is to locate.