Planning to build a wooden greenhouse this spring. I have a number of old windows in good condition, so it should go well. I will build a frame with 45x95mm studs, with about 600mm centers.
However, I have some questions about the roof construction. The greenhouse will be 260x450cm, with a side height of about 200cm and a ridge height of about 250cm. The roof will be made of channel plastic, so there won't be any large loads other than possible snow (Stockholm area).
I see two different options.
1) A ridge beam of 450cm plus overhang resting on the gables.
2) Roof trusses. However, these will take away some of the volume in the greenhouse, so I'm not too fond of this solution.
So, how have you others done it, are there more options?
How sturdy does the ridge beam need to be given these conditions?
However, I have some questions about the roof construction. The greenhouse will be 260x450cm, with a side height of about 200cm and a ridge height of about 250cm. The roof will be made of channel plastic, so there won't be any large loads other than possible snow (Stockholm area).
I see two different options.
1) A ridge beam of 450cm plus overhang resting on the gables.
2) Roof trusses. However, these will take away some of the volume in the greenhouse, so I'm not too fond of this solution.
So, how have you others done it, are there more options?
How sturdy does the ridge beam need to be given these conditions?
Gable roof is always a simpler option for the DIY enthusiast. Glulam allows for slimmer dimensions. Who said the roof needs to be fixed above the rafters?
I will try to describe how wooden greenhouses were built before aluminum constructions became fashionable.
Foundation: Cast base with standing UNP100 beams every other meter (in your case, a total of 6). The beams are placed 90 mm in from the finished foundation's outer side. Build with leca blocks between the beams, up to a suitable foundation measurement.
Walls: Sill paper, sill of 45x95. Standing mullions of 45x70, with c/c matching the glass width. Hammer beam 45x95, through-bolt in the standing beams.
Roof: Mullions 45x70, corner mullions against gables 70x70, ridge plank 45x195.
Gables, mounted last: Mullions 45x70, door frame of 45x145.
At that time, it was possible to buy mullions with pre-made glass rebates, but it is just as fine to make them yourself. Either with a router, or even simpler, nail on a thin strip 15x22.
Ventilation windows and doors are added.
The greenhouses were often built entirely from pressure-treated wood.
Foundation: Cast base with standing UNP100 beams every other meter (in your case, a total of 6). The beams are placed 90 mm in from the finished foundation's outer side. Build with leca blocks between the beams, up to a suitable foundation measurement.
Walls: Sill paper, sill of 45x95. Standing mullions of 45x70, with c/c matching the glass width. Hammer beam 45x95, through-bolt in the standing beams.
Roof: Mullions 45x70, corner mullions against gables 70x70, ridge plank 45x195.
Gables, mounted last: Mullions 45x70, door frame of 45x145.
At that time, it was possible to buy mullions with pre-made glass rebates, but it is just as fine to make them yourself. Either with a router, or even simpler, nail on a thin strip 15x22.
Ventilation windows and doors are added.
The greenhouses were often built entirely from pressure-treated wood.
No one has said that, but in quite a few pictures and sketches I've found, it's been like that, hence my question. A mono-pitched roof is not an option as it wouldn't fit in with the house and the rest of the neighborhood.Apprentice said:
I can recommend the book "Moderna växthus" from 1926. It details constructions for small and large greenhouses of all kinds. I found my copy at http://www.bokborsen.se/index.php. Unfortunately, it is currently packed away - due to (that's right) renovation - so I can't check it for you.
See also:
http://www.byggahus.se/forum/byggmaterial-byggteknik/70621-takstolskonstruktion-till-vaexthus.html
What kind of wood are you planning to use? I'm also thinking about greenhouses and am leaning toward kärnfur or heat-treated wood, I don't want pressure-treated in the greenhouse.
See also:
http://www.byggahus.se/forum/byggmaterial-byggteknik/70621-takstolskonstruktion-till-vaexthus.html
What kind of wood are you planning to use? I'm also thinking about greenhouses and am leaning toward kärnfur or heat-treated wood, I don't want pressure-treated in the greenhouse.
Here is a price list, scroll down for "växthusglas"
http://www.allglas.se/intelligens/kund/sida.asp?sida=64
http://www.byggahus.se/forum/foenster-doerrar/86189-foensterglas.html
http://www.allglas.se/intelligens/kund/sida.asp?sida=64
http://www.byggahus.se/forum/foenster-doerrar/86189-foensterglas.html
Here are designs for different greenhouses.
http://bioengr.ag.utk.edu/Extension/ExtPubs/PlanList97.htm#Greenhouse Plans
http://bioengr.ag.utk.edu/Extension/ExtPubs/PlanList97.htm#Greenhouse Plans