lintel

i wish to install a pvc window in the gable end wall for my
loft question is do i need a lintel above the window ,
the window is 645mm X745mm.
including the cill and what are the regs on this
sort of thing thanks
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What's the construction and thickness of the wall?
Yes, you'll need Building Regs approval for the structural opening and for the window itself. You're not going to use the loft as a room are you? If so you'll need to do a lot more work, like strengthening the floor and providing Means of Escape in case of fire etc etc.
You should also talk to Planning, esp if you're in a conservation area or if the window overlooks next door, and ask them if they need an application. Give them a few more details than you've put on here though!
Peter
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outer layer standard brick with a 70mm cavity and iner layer standard brick

If so

and providing

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SCAREY-B.HERE-ON-THE.NET wrote

Certain it's 70mm? The internal brick tells me it's a fairly old house and cavities were virtually always 50mm in those days, although there could have been some build inaccuracy or some bulging of the outside skin. Anyway, either way the easiest way to do this is with a Catnic CN7A lintel (for 50mm cavity) or CN3A (for 70mm). If you can slide the lintel up inside the cavity you could use a CG50/100 or CG70/100 which saves a bit of work.
A Catnic is the best for this job as it does not need a separate cavity DPC above. It's 150mm deep and needs to be min 300mm longer than the width of the opening to give 150mm bearing each end. They come in 300mm increments in length.
You're going to need an access tower and hire 1 or 2 Jackall wall supports from HSS to support the wall while you cut out the bricks to insert the lintel. These will save having to support the brickwork all the way down to ground level.
see www.catnic.com and look for Products > Lintels > Cavity Wall Combined Box Lintels or Open Back Lintels
Peter
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"SCAREY-B.HERE-ON-THE.NET" wrote | > Means of Escape in case of fire etc etc | .well would this not be the window
Possibly not.
Escape Windows:
- An Escape Window must be accessible via a ladder to assist rescue of the occupants from the new room(s). - Whether incorporated within a dormer or a roof light, it must have a clear opening area of 0.33m2 with either the height or width being at least 450mm. - The escape window should be within 1.7 metres of the eaves, measured along the roof slope. - The height of the sill of the vertical window should be between 800mm and 1100mm above the floor, and for a roof window between 600mm and 1100mm above floor level.
<http://www.stevenage.gov.uk/council/dept-env-services/building-control/bc-l eaflet3.htm>
See also
http://www.hullcc.gov.uk/buildingcontrol/leaflet_04.php
Owain
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"Owain" wrote | "SCAREY-B.HERE-ON-THE.NET" wrote | | > Means of Escape in case of fire etc etc | | .well would this not be the window | Possibly not. | <http://www.stevenage.gov.uk/council/dept-env-services/building-control/bc-l | eaflet3.htm> | See also | http://www.hullcc.gov.uk/buildingcontrol/leaflet_04.php
And of course Hugo Nebula's Loft Conversion FAQ at http://groups.google.com/groups?thz849f7121bbb36
Owain
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On Fri, 26 Dec 2003 11:24:37 -0000, a particular chimpanzee named
produced:

Or even the new, improved version at http://www.bathnes.gov.uk/buildingcontrol/loftconversionguide.htm.
--
Hugo Nebula
"The fact that no-one on the internet wants a piece of this
  Click to see the full signature.
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Peter Taylor wrote

not to mention a new staircase
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