Roof in an extension - online guide to choices

[anonymous-user]

[redacted]

[herbialfa]

eH?????

Photos/ diagram would help! :-)

[D14 AYS]

There is no reg on ceiling height any more, you tend to go to the physical space available in loft conversions, I would suggest you get an Architect in to give you a few ideas

[D14 AYS]

The extension over the garage will balance the house up nicely, depending on budget/need for space, I would consider a re-pitch of existing roof into new extension roof, to create another floor.

[D14 AYS]

With all loft conversions the new floor joists/steels/roof has to be totally independent from existing ceiling joists, therefore minimal disturbance to existing ceilings and the like, the only disturbance would be the new stairwell, that said your architect/builder on site will give you the definitive answer to that.

anonymous said:

[redacted]

Unsure on this one

anonymous said:

[redacted]

15k wouldn't cover pitching/converting existing roof, but without looking at drawings its always hard to put a figure on these kind of jobs.

[D14 AYS]

anonymous said:

[redacted]

Remember to get the pool table and Jukebox craned in before roof is finished

Good luck with your project.

[herbialfa]

You will also have to 1/2 hour Fire protect the room above the garage!

[eps]

You really need to get someone to do the headrooms for you..

Ideally/normally downstairs should be 2000 - 2200mm (but it is what it is) then there's about 200mm of flooring and then upstairs 2000-2200, then another 200mm of flooring and then you have.... left for the loft?

From the look of the property, the existing roof pitch and the need for an extension to be diminuitive to the existing property I don't think you will be able to fit anything usable in the loftspace above a proposed extension on top of the garage.

But check all of these of course.

[flyingjase]

I'm also looking at a potential loft conversion (Sorry Phil, I will look at the plans this weekend and get back to you)

But one question that has been asked (I think) in this thread, is are there any construction methods / new / innovative ways of reducing the 'wasted space' to create more headroom?

eg Phil, you talk about 200mm for flooring, is there not a new fangled product that is building regs compliant that can reduce that to 100mm
? Or on the Roof joists that need to be packed with insulation (again taking away head height), is there not a skinny roof joist and a thinner type of insulation?

If you could gain 100mm from the loft floor and 100mm from the loft ceiling / roof, then that could make a big difference.

[spikeyhead]

anonymous said:

[redacted]

You need to ask a lawyer

[Busamav]

eps said:

From the look of the property, the existing roof pitch and the need for an extension to be diminuitive to the existing property I don't think you will be able to fit anything usable in the loftspace above a proposed extension on top of the garage.

I think you have it covered there .

Tonker , the extension would need to be hipped , so go stand in your loft and imagine whats left, It isnt going to be good .

[V12Les]

As above...plus unlikely youll be able to keep the ridge line the same as existing let alone raising it higher. Non starter in my humble oponion.

[Busamav]

If you were going to hit the main roof ,

you could just put in attic trusses with a steeper pitch (all subject to planning of course ) these things are a blessing in disguise and very cheap .

But just for the main roof alone you could be running to 70k + quite quickly , bearing in mind a normal loft conversion can be 35k quite easily , then the extension and roof space to that .
In the grand scheme of things you could then be looking at a 130 k + vat project , then of course you need to do the sums on the uplift of the property value .

Still , its a lot of accomodation for the money .

[Engineer1]

As an Idea, I assume the gargage will have to come down in which case lower the gargage floor a foot or two, adding drainage, then build your second floor and attic space extension above, all assuming you have the ability to have the windows at the right height with the ceilings.

[eps]

flyingjase said:

I'm also looking at a potential loft conversion (Sorry Phil, I will look at the plans this weekend and get back to you)

But one question that has been asked (I think) in this thread, is are there any construction methods / new / innovative ways of reducing the 'wasted space' to create more headroom?

eg Phil, you talk about 200mm for flooring, is there not a new fangled product that is building regs compliant that can reduce that to 100mm
? Or on the Roof joists that need to be packed with insulation (again taking away head height), is there not a skinny roof joist and a thinner type of insulation?

If you could gain 100mm from the loft floor and 100mm from the loft ceiling / roof, then that could make a big difference.

Jase, no problem, I know you'll be busy from now on (extra busy!!)

You might be able to put 100mm joists in, although I'm guessing something like a flitch beam or similar.. It merely doubles or trebles the cost of that item..

Rafter-wise.. Insulation, best product is Celotex but... This requires a 50mm air gap for ventilation. You need at least 150mm Celotex in place (possibly more, figure is off the top of my head) therefore you rapidly approach 200mm.. We might be able to put some lovely "tri iso multi foil" in, which may well give all the right numbers but there's only one version of that which is BBA approved (i.e. the others haven't passed the tests) and even that's a bit dubious.. For insulation you can't get away from having a thick material. I'll take a look at the numbers again..

[Busamav]

are there TPO's on any of those trees ?


whhat vicinity tonker , Ham / Kingston ?