On Sunday, August 4, 2013 4:19:02 PM UTC+1, James wrote:
Please could I ask for advice from anyone who has experience of repairing o
ld slate roofs? Two adjacent rafters on the same side of the roof have slip
ped down where they rest against the ridge pole, and are now partly below t
he ridge pole. If they go another inch or so they will be below the ridge p
ole so will have no support at the top. I can't see why they have moved so
I assume they have simply bent a little between the ridge pole and the top
purlin. The ridge pole appears to be still straight, and the corresponding
rafters on the other side of the roof are ok. Is it better to leave the sla
tes and timbers where they are, and try to reinforce the timbers from the i
nside, and if so any suggestions on how to do the repair? Alternatively, sh
ould I remove some ridge tiles and slates, and try to add new sections of r
after from the outside? Or some other method? Any practical hints gratefull
y received. It's a barn with stone walls, roof span 9.3m (30ft). Three purl
ins on each side. Rafters 50mm x 50mm. Quite old, but I don't know how old.
Very much doubt if you will be able to lift the rafters level because of th
e weight of slate used. The only way I know of is to get a length of 4"x2"
100mm x 50mm and place across under the rafters either side under the top e
dge and you may be able to lift the dropped rafters. Screw one end to a goo
d rafter and prise up to try to get a fixing in one of the other secure raf
ters. Then screw the drop rafters to the 4"x2"