|what side up does the felt go|
|Strip off the old and remove all nails.|
materials: Roll 2ply plain.. Roll 3ply mineral [depends on roof size so measure and check rolls].
Tin felt jointing compound.
Cheap pointing trowel. White spirit to clean hands.
[mastic has habit of jumping out of the tin before you can get the gloves on.]
1/2 -3/4 inch clout nails.[large head] at least 3/4 inch ones for folds on corners.
measure the 2ply plain don't bother with overlap that comes with finished felt.
Random nail first strip working from bottom of roof to top. Mastic top edge of each strip to bed down the next strip trowel mastic over each nail toe ensure seal even thought it will be covered by the top layer.
keep going up to ridge section then do same for other side.[unless it's a flat roof]. Now for the 3 ply mineral.[the finish felt] allow an overlap all around bottom and edges to left and right of first layer tack down using 3 nails in the black joint strip which should be on the roof not the eaves [bottom]. don't hammer them home you might have to remove them. Once you are satisfied the felt is in correct positon hammer the tacked nails home adding a few more along the black strip ONLY. liberally mastic the joint strip and lay the next strip which obviously will only have overlaps each end, cut off levele with ridge or overlap if flat and tack is all the way along endge overlap about every four to 5 inches fold the corners and tack with longer nails. On a pitch roof you need to fix a capping over the ridge. allow a drop or overlap onto the roof each side about 6 inches. liberally mastic up to edge of overlap and where each strip lies along the ridge so all joints are sealed nail the ridge strips down and wipe/trowel mastic over the nail heads. Don't put any nails in the finish felt middle Nail in the overlaps......the mastic joints and nailed overlaps hold it in place.
Confused? then take a look in Wickes and B&Q their help leaflets have one on felting a shed rood.
Also check what they have to make it cheaper or easier.