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So using collars etc.. doesnt help to reduce the horizontal force ?

Correct and they are probably suitable for loose cut roofs in the raise tie scenario. However, since loose cut raise ceiling roofs generally have some sort of SE calcs backing up the sizes specified its generally assumed that horizontal thrust will also of been included in the calc and...

Wait Im confused, if the roof timbers are sitting on a wallplate why do you need hangers ? What hangers do you need ? for fixing into masonry or fixing into timber ? For either scenario Simpsons Strong Tie will offer both..

Yeah its not a massive span in terms of trusses and im certain the ceiling could be designed high enough to get the velux fully in the leg of the truss. I can post a design up monday if you havent already made your mind up. Should give you a clearer picture

Glide shoes on loose cut roofs, agreed, never seen them specified in that scenario or have supplied them my self. Trussed rafter roofs, supply them on practically every raised ceiling job where calculation shows needing them. Can understand the reason you prefer steel then, cant believe...

Or.... After also veiwing your sketch, why not just use raise tie trusses ? Surely costs of materials, ridge beam would not be less than pre manufactured trusses?

If the op wants to use glulam for a ridge without any collar ties, then 90 x 360 GL28C would work based on 5.040 run for ridge, carrying 2x6 rafters at 600mm centres with rafters doubled up for 2 veluxes either side.

I'd check and make sure that any floorboards that do not finish on a joist are supported by noggins. If they are left unsupported they will move and can 'lift' causing squeaks between fixings. Studwalls also can be a cause for squeaks, when nailed down to a floorboard without proper...

If you are concerned about BI querying the lean to roof pushing out the new walls, then you could consider using 50mm glide shoes which would help to reduce this. They are more commonly used in Trussed Rafter roofs and not in traditional cut roofs (well certainly not in my area anyways)...

It would be possible to design a Engineered joist that would clear that span, although it would be a stupid depth (around the 475mm mark ) Honestly probably not an option. Otherwise a Bison Floor as woody stated, or you break the span up with a RSJ and give your self more options on what...

LOL Classic example ... Its amazing how many plumbers actually do that though... we have to do at least 1 detail a month for things like this .. Always makes me giggle

It is frowned upon, but really depends on which BC it is. We have had it where on one job we have had to do between and over rafters then on another it was all between rafters. And both where passed !! LOL @ oldun, How come you never use / specify glulam ? Seems alot of extra work...

The joint of the board can land anywhere, but any unsupported joints (over 75mm) must have a noggin to support it.

Extending 5 mts from the house I would take as run or length and 4mts wide I would take as the span. As he was asking where to find calcs to size structural ridge & rafters and there was no mention of ceilings, it was clear to me that it would be a vaulted style roof. That coupled with the...

18mm T&G chipboard is commonly used on floors @ 400mm centres, so i dont see why it isnt suitable. And why would you want to make it more moisture resistant?

If you decide to use glulam, then whoever you buy it off would be able to size it up and supply calcs for BC. Providing they offer that service, so it may be best to check before hand.

It also depends heavily on the width of the opening. If the rafter length (or rake) is 3.6 then i would agree, it probably would not be necessary.

Well based on the dimensions given and dependant on actual velux size, rafters should work at 2 x 6 (600mm centres) held up by a piece of 315mm Glulam for ridge. Doubtful you would need to get a strutural engineer to work out the rafters or structural ridge beam, most roof truss...

If the opening is wider than the centres, then the golden rule is always double up.