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I've had to go for PIR's for the entry exit zones in my new house. Both the hall and the kitchen will be the entry/exit points. I am wondering if I should use dual (IR + Microwave) detectors in these areas as both will have direct sunlight and heating (radiator in hall and cooking appliances...

As a newbie installing my own alarm I have asked my builder to run in wiring for the system. He told me that with a lot of modern doors being metal framed most installers now use PIR's in place of contacts on front and rear doors? Is that true? I don't have problem using PIR's for that...

Thanks for the replies. I don't yet know the make up of the door so it will be difiifcult to tell what the top and edge of the door is constructed of under the skin. I suppose the electrician will have an idea as he has wired many similar properties and will probably have wired for some...

My new house is currently being pre-wired for an alarm that I will fit when I move in. The front and rear doors are metal framed with PVC skin. Will this present problems for door sensors? If so would I be better using PIR at the front door/hall and the same for the back door/kitchen...

Just when we thought Sat Night Fever had died away it's back :P Sorry non-technical post, I had a Deja Vu moment and couldn't resist :?

You guys are very helpful. I'm a bit more dismayed tonight to find the thickness of the Celotex is actually 15/16 mm! ajrobb, maybe if you could be so kind to do a recalc and see what comes out? Strange thing is they have a pile of Celotex stacked up at the house that is at least 30mm...

I'm moving into a new house soon. It's brand new and on inspecting a similar house I found that in the roof space they now have the insulation not only level with the joists but at least another 150 mm above them. That's good news from an Eco point of view and saving on heating costs but...

I'm having a new house built at present and the builder will run in the wiring for my alarm, sensors and bell box if I give him the details. I'm confident enough to fit a wired alarm but have no idea what type to buy and more importantly where I need to site the PIR's and door sensors...

Thanks guys for all the info. I sort of made some progress today. I found out the celotex is just 25 mm thick, and the thermal blocks are 100 mm but for the life of me I can't remember the name :cry: Anyway the design is 100mm brick, 50mm air gap, plus the 25 mm celotex, and the thermal...

A picture of another hosue nearby showing the foil panels taped and secured by red fasteners.

It's Celotex and they appear to be tiles about two feet square. I managed to look at another similar house and confirm the material. Still don't know what the thickness is but will be inspecting it on Fri as I am meeting the site manager. I am none to happy with what I have seen, including...

My first post so please be gentle :wink: I'm buying a new house, currently being built. Every week I pay a visit and take some photos, unfortunately I can't get too close because of the screens. My queston concerns the cavity wall insulation. I have attached a zoomed picture of the...