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Hello DIYers,
3 bedroom mid sized terrace with slated, relatively shallow pitches circa 1900, 2 purlins per pitch. One purlin has been bowed for many years and seemed stable, now a severe crack both vertically at the lowest point of the purlin and also longitudinally has appeared.
Ridge has cracked and there is roof sagging at the ridge and at the cracked purlin.
The purlin depicted is the upper of the two on this pitch.
My intention is to remove the roof entirely and replace all structural elements, 4 purlins, ridge, all rafters, slate battens, new felt, lead, warm roof insulation, re-use slates.
Q. I understand that a NFRC competent roofer is able to specify the dimensions of the structural elements without relying on external input (costs) Is this correct ?
Q. Is it mandatory to replace timber in such a case for steel RSJ ?
Q. If not what are the pros and cons of timber over steel (specifically wrt to loss of "head height" under the RSJ )
Q. I believe this work is urgent and so a temporary roof will be needed, How long do you estimate it would take to build the scaffolding 1 day or 3-4 days ?
Thanks in anticipation,
KW
3 bedroom mid sized terrace with slated, relatively shallow pitches circa 1900, 2 purlins per pitch. One purlin has been bowed for many years and seemed stable, now a severe crack both vertically at the lowest point of the purlin and also longitudinally has appeared.
Ridge has cracked and there is roof sagging at the ridge and at the cracked purlin.
The purlin depicted is the upper of the two on this pitch.
My intention is to remove the roof entirely and replace all structural elements, 4 purlins, ridge, all rafters, slate battens, new felt, lead, warm roof insulation, re-use slates.
Q. I understand that a NFRC competent roofer is able to specify the dimensions of the structural elements without relying on external input (costs) Is this correct ?
Q. Is it mandatory to replace timber in such a case for steel RSJ ?
Q. If not what are the pros and cons of timber over steel (specifically wrt to loss of "head height" under the RSJ )
Q. I believe this work is urgent and so a temporary roof will be needed, How long do you estimate it would take to build the scaffolding 1 day or 3-4 days ?
Thanks in anticipation,
KW
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