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Greenhouse query

• Message 1. 

  Posted by Peter Bangor (U10940962) on Saturday, 11th February 2012

  I am rebuilding an old green house. Everything including the glass has been scrupulously cleaned. I notice that there are gaps around the top of the walls where they meet the roof.
  Is this a design feature for air circulation or should these gaps be filled?

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• Message 2

  , in reply to message 1.

  Posted by thedogcody (U14659366) on Saturday, 11th February 2012

  Mmm-doesn't sound quite right to me-how much of a gap-is it wooden or aluminium?

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• Message 3

  , in reply to message 2.

  Posted by Goldilocks (U2169760) on Saturday, 11th February 2012

  Not sure what you mean by gaps. Could it be a continuous horizontal groove in the brickwork pointing to accommodate flashing to stop water running down the wall and into the greenhouse.

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• Message 4

  , in reply to message 3.

  Posted by thedogcody (U14659366) on Saturday, 11th February 2012

  I am getting very confused are we talking greenhouse walls or brick walls-is it freestanding or lean-to ?

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• Message 5

  , in reply to message 3.

  Posted by Tee Gee (U10012255) on Saturday, 11th February 2012

  I am guessing this is at the eaves where the roof meets the top of the sides!
  
  If I am correct then it would seem the roof glazing bars have not been morticed into the top rail. and the overhang is quite short.
  
  This quite common on wooden greenhouses.
  
  Remedies;
  
  You could leave things as they are to act as vents if you like, but note this can also create drafts plus it is access for the wind to get in during gale force weather.
  
  Plus birds can get in.
  
  You could fill this gap up with foam or polistyrene but it will rot if not UV treated.
  
  You could use strips of loft insulation.
  
  Personally I would cut pieces of thin external plywood to the width between the glazing bars,( facsia boards if you like) and nail them to the top rail with the top of the ply touching the glass.
  
  Added to that rather than nailing them all on, I would screw a few of them on, then you could remove these in summer to act as vents.
  
  These can then these could be screwed back on for the winter.
  
  I hope that explanation gives you some ideas...Tg
  
  

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• Message 6

  , in reply to message 5.

  Posted by zoomer44 (U14019069) on Saturday, 11th February 2012

  There's a gap of about 1inch around the top of my aliminum GH on oneside were the glass sides meet the roof but the gutting over hangs it. I assumed all GH's came like this....but apparently not
  
  Mines a very old GH which was rebuilt, it's possible the last owner had new glass cut too small on one side when replacing it. Can't say the gap has caused any problems and fortunatly it's on the house side and so gets no wind.
  
  How big is the gap? Is it on both sides?

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