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He did, it was me :D During my initial pre-application discussions the BCO explained what he wanted to see; as in Vapour Barrier and DPM. I added the to the plans before submitting them. I now have to start getting all of my materials together, priced and ordered. Hence the question...

It is under a Building Control Application, at the initial pre-application discussions they asked for it so it is now on the submitted plans.

We need 3 interconnecting mains powered fire alarms for our extension. I would prefer battery backed up ones for safety. What is the practical differences between Photo Optical, Ionisation, Photoelectric and mains heat alarms? And where would you use each type?

Thanks for the confirmation. what gauge would you recommend for my requirements?

Extension is not built yet so I expect it will be Noggins. Span is only 2.6m gap so only 1 noggin required.

So in my scenario I use a thick DPM on the concrete block wall, the 50mm battens with 50mm urethane between. Then what should I use as a Vapour Barrier before applying 12.5mm plasterboard? (foil backed plasterboard is expensive)

In terms of materials used what is the difference between a Vapour Barrier and Damp Proof Membrane? I believe we need to use both to insulate and dry line our garage walls. These are 9" thick:- brick out and concrete block in and no cavity. Plan is to have DPM, 50mm battens with 50mm...

Plasterboard and a few bits of timber or clay flowerpots would be cheap enough.

So I presume with std 2400x600 18mm chipboard floors at the moment, the joins can not be over 450mm spaced joists.

My house is 17 years old, 1st floor joists are 200x50mm with 450mm centres. I have copied this size in the extension (Done my own plans) and so far the BCO and structual engineer haven't commented on it. Garage conversion may be 125 or 150mm by 50mm joists, but these will be on the floor...

Aaah! Makes sense, although using the term 'maintained' for it doesn't!!

Sorry to question your advice, but why 400mm centres? (The extension and existing house have 450mm centres on 1st and loft floors.)

I have looked into this as I am building an extension and will have spotlights between the floors (BCO insist on insulation between floors for sound damping) You could build some plasterboard boxes to go over them, or some clay flowerpots with the hole in the top to let heat out (Make sure...

What's the difference between maintained and non-maintained emergency lights? (May be a stupid question!) For example on here http://www.toolstation.com/index.html?code=95784

Yes, I was expecting the board to be at 90 degrees to the joists, and staggered like bricks. However do the end joins need to be on joists or doesn't it matter as they are interlocked?

That's the one.

Have to be careful how I answer that one... She is a Holistic Therapist, doing Body Massage, Aromatherapy, Reflexology and Indian Head Massage. For BCO and Planning it is a 'Bedroom' as well as a clinic and therefore does not need a change of use.

We are converting 3/4 of our garage into a bedroom/clinic for my wife. The Garage already has a concrete floor with DPM. The plan is to install a 2nd DPM over the concrete then make a false floor with 125mm joists, followed by 18mm interlocking chipboard floor (75mm urethane Insulation...

How critical is the spacing of floor joists? We are planning on having 450mm centres in our extension 1st floor, do the 18mm interlocking Chipboard floor boards have to meet on joists or as long as they are screwed down (and possibly glued together) securely they will be ok?

Thanks Jason Where's the best source of supplies? (B&Q is expensive for grouts etc and the like of Tiles R U are even more expensive!)