carlos21

thanks for the replies, yes it is a true warm roof with all the pir board on top. the vents would be just for the ends of the rafters around the overhang area. i was on the fence about the vents then i opened up all the pvc fascias and soffit order to find that i didnt have any vents so that kind of answered that for me. i could always retrofit some circular ones with a holesaw i guess. another question, wide (350mm) 10mm thick fascia mounted onto a thick continues timber, what spaces for the nails?? i did 3 for the width of the board ie one top, middle and bottom at 800mm centers but not sure if thats a bit skimpy, i just didnt want it to look like it was peppered with nails. thanks again carl

i have a warm roof, the cavity wall insulation goes right up to the underside of the roof deck and will be airtight sealed from the inside. should i put in a few soffit vents in the roof overhang that will be soffited? i thought it a good idea to have a bit of air flow around the ends of the joists. it will have standard pvc fascia and soffit. any thoughts thanks carl

update, the joists done, i went with notching as the room wasnt square i wanted to be a bit flexible with the joist spacing, plus i got to play with my new cordless circular saw! feel a bit late to the party, what a lovely tool to use compared to a mains one , so light and quiet. i did use joist hangers on different parts of the floor and they seemed strong and easy to use. thanks again for your help.

could you fix something into the ceiling joists above?

thanks for the replies, given me a bit of food for thought. its all internal so no cold bridging issues as such. great forum, always pops up when i google building questions, so thought i may as well join up. carl

cool thanks for the reply, the notch is only 10mm deep so as to make the bottom of the joist flush with the bottom of the i beam. thanks again, carl

hi folks, iam putting part of the new floor/ceiling 7x2 joists into a steel I beam over a new opening, iam just wondering whether its better to notch the timber and rest it on the i beam flange ( 45mm ) or bolt a timber to the web of the i beam and use joist hangers, it seems to me either would work ok, so just wondering if there was a reason for choosing one over the other. many thanks carl.