Hi i was wondering if any one could help me. I'm looking at converting my loft but only upgrading floor to take additional weight. Removing an existing Velux and installing 1 velux cabrio balcony style with the side windows. The current floor timbers are 125mmx50mm and the rafters are 100mmx50mm.
Just so i can work out if i have enough head height after new sized timbers and insulation are added to roof and floor and timber are upgraded
1) Would 200mmx50mm floor beams be adequate
2) Would all the rafters need upgraded to a larger size to carry weight of new roof windows or just cut them out as shown and relocate the purlins to top and bottom with vertical struts from rafters back to new floor beams at the lower side of the velux
3) What sort of depth of insulation should there be allowed in the roof? would this require the deeper rafters to accommodate or would there be nough room.
4) Can the 4No horizontal ties in photo be removed? If they are how do you prevent the rafters from splaying out.
5) Would i require any steelwork added to support the roof to accomodate my proposal. There isnt any dorners but quite a bit of the existing rafters will need to be cut out to accomdate the velux.
I have attached a photo looking from inside and few views from my planning drawing showing how the velux will look inside and out minus any timber / insulation works. But i need to make sure the loft can be converted within regs and i'll have the space inside after new timbers are installed before i waste money on even applying for planning.
Thanks for any help
Just so i can work out if i have enough head height after new sized timbers and insulation are added to roof and floor and timber are upgraded
1) Would 200mmx50mm floor beams be adequate
2) Would all the rafters need upgraded to a larger size to carry weight of new roof windows or just cut them out as shown and relocate the purlins to top and bottom with vertical struts from rafters back to new floor beams at the lower side of the velux
3) What sort of depth of insulation should there be allowed in the roof? would this require the deeper rafters to accommodate or would there be nough room.
4) Can the 4No horizontal ties in photo be removed? If they are how do you prevent the rafters from splaying out.
5) Would i require any steelwork added to support the roof to accomodate my proposal. There isnt any dorners but quite a bit of the existing rafters will need to be cut out to accomdate the velux.
I have attached a photo looking from inside and few views from my planning drawing showing how the velux will look inside and out minus any timber / insulation works. But i need to make sure the loft can be converted within regs and i'll have the space inside after new timbers are installed before i waste money on even applying for planning.
Thanks for any help