Hampshire (self) build

[Lee B]

Evening all,

 

Have spent a year researching the project, often ending up on this site, and own the obligatory Housebuilder's Bible: No. 12.

 

Plans approved for a 4-bed home in our garden, pics attached:

• 15m x 8m with main 15m side facing south, half the footprint is double height.
• Looking at SIPs for wall/roof with render onto carrier boards.
• Glass panels where the roof splits provide light into the upstairs rooms.
• Small matter of approx. 300sqm permeable drive/parking areas, double garages for existing and new house etc. etc.

 

Prospective builders have suggested that we sort out the build method and window supplier, then they'll come onboard to organise groundworks and all the trades.

Keen to understand in practical terms (who doesn't love a spreadsheet!) the merits of living with 142mm vs 172mm SIPs, dbl vs triple glazing and how not to end up with a greenhouse.

 

[ToughButterCup]

Welcome.

5 minutes ago, Lee B said:

[...]

and how not to end up with a greenhouse

.[...]

 

Research  brise soleil

Good luck.

Ian 

[vivienz]

Welcome!

It's worth researching your shsding options as early as you can, not least do that you can account for the cost. Keeping heat out of a building isn't cheap.

I'm using Contrasol Ltd for the brise soleil in front of our ground to roof height window in front of the stairwell, which faces almost due south. They have been pleasant to deal with.

[Adrian Walker]

I would strongly suggest that you get your design checked for heating and cooling using PHPP or similar.  This will save you £Ks is building and running costs.

 

 

[NSS]

1 hour ago, recoveringacademic said:

Welcome.

 

Research  brise soleil

Good luck.

Ian 

And SageGlass 

[ProDave]

As well as the windows and possible excess solar gain, SIP panels tend to be a type of insulation with a low decrement delay, so you are likely to get overheating through the walls as well.

 

What are beds 3 and 4 doing for windows?

[Lee B]

3 minutes ago, ProDave said:

As well as the windows and possible excess solar gain, SIP panels tend to be a type of insulation with a low decrement delay, so you are likely to get overheating through the walls as well.

 

What are beds 3 and 4 doing for windows?

Beds 3&4 have velux windows (north facing) in addition to the glass running the length of the split in the roof which faces south.

[Adam2]

Hi, I know you didn't ask about the general design but I was interested in this. The exterior looks great and the double height interior very nice too (though a bit stark for me) 

 

If you don't go with external sun shading looks like you will be in a green house. It's not as effective but you could consider to incorporate in glazing blinds to help. 3G will also help reduce solar gain; more so with appropriate coatings.

 

Good luck

Edited January 22, 2019 by Adam2
Looked again at plan and saw another bathroom :-)

[ProDave]

9 hours ago, Lee B said:

Beds 3&4 have velux windows (north facing) in addition to the glass running the length of the split in the roof which faces south.

Are you sure those will be low enough and large enough to be a means of escape?

[Lee B]

7 hours ago, ProDave said:

Are you sure those will be low enough and large enough to be a means of escape?

So as to avoid overlooking, the windows are at approx 2m.  The house it set back 40m+ from the road and with no space for a fire engine to turn round, we went with a fire suppression system (Quantum Fog or similar).

[ProDave]

2 minutes ago, Lee B said:

So as to avoid overlooking, the windows are at approx 2m.  The house it set back 40m+ from the road and with no space for a fire engine to turn round, we went with a fire suppression system (Quantum Fog or similar).

Does that negate the BR requirement to provide a means of escape via a window?

[Lee B]

3 hours ago, ProDave said:

Does that negate the BR requirement to provide a means of escape via a window?

From memory, B1 requires an appropriate means of escape in case of a fire.  Escape via a window is the general guidance on compliance (2 storey building), but Building Control will take other measures into account.

[TerryE]

You need a means of escape for every living room.  This is either a direct exit from the room or a 30 minute rated safety corridor.  You seem to have neither, so I strongly advise you appoint an commercial Building Control company (JHAI or the like) and discuss this in detail with your allocated officer before you finalise the design.  

 

You've got a lot of glass and bifolds = lots of heat losses in winter; poor airtighness; major issues with cooling for the rest of the year on sunny days.  Embedding decent thermal performance into your build is going to be a major challenge for you.