It could be the flashing so you will need to check that as well.
Slate roof and wood beams leaking brown liquid.
In an attempt to decrease that pressure the molecules begin to move outwardly that results in an expansion or wound in the wood.
5 common reasons for a roof leak.
Structural damage is inevitable if there is a serious and long standing roof leak.
You can also face expensive wood framing repairs if water leaks down into ceiling joists and walls.
Place the shingle or plywood onto the tar and spread more of the tar around the edges of your patch.
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You also need to check the sheathing under the slates when you re fixing leaks.
The damage from the expansion allows the wood sap to bleed or sweat out from deep within the beam.
The flashing and the guttering are actually the weakest points of a slate roof so look at them first.
Don t automatically assume it s the slate roof that s at fault.
The nail will provide a path for the water.
Map the roof leak.
Spongy and weak water damaged wood can end in peeling paint damaged ceilings and buckled wall coverings.
Chapter seminar november 1990.
Step 2 place a bucket underneath the nail to catch the water as it runs down the nail.