Have a good look at the exposed timber especially where there were holes in the felt and make sure.
How to replace a shed roof felt.
Remove the old felt.
Remove any existing timber fascia boards.
Laying the new felt ridged.
Tidy up the overhanging felt.
Clean and prepare the roof.
The first step in felting a shed roof either angled or flat is calculating the exact dimensions of your roof.
The real beauty of installing a professional quality roofing felt to a shed roof is the utter lack of specialist tools required unlike other high performance roof coverings.
Measure the roof of your shed.
Paint a layer of adhesive such as bitumen mastic over the top of the first felt layer a length at a time.
Apply the felt to the roof.
Remove excess felt nails and adhesive before replacing the felt on your flat roof.
The first thing you need to do is remove the old worn felt from the roof.
How to felt a shed roof.
Replacing shed roof felt removing the old felt and nails.
The process of felting a shed roof.
Roll out the first layer of felt.
When you are felting a sloped roof you start at the bottom and work your way up so that rain pours over the top of the laps and not under them.
Once measured and cut line the first piece of felt up so that it over hangs the edge of the roof on three sides by enough to cover the side pieces of the roof.
Previous step next step.
A hammer a craft knife preferably with a hooked blade but not essential an old 2 brush and a flat pry bar as seen in my roofing tools section will help.