Adding connected sun room and greenhouse, suggested plans?
I’m thinking of taking this concept and adapting to my situation.
Mine can be 15′ wide, connected to the house by addition’s north wall. Needs to be at least 25′ long, up to max 35′.
North wall of addition would join the house, and the long dimension will go south. The sides face east-west.
I plan to add the wall so I can pack it with insulation and make it sturdy for heavy snow years.
Unlike pic, I’ll have a complete or partial clear roof, and large windows on the south and west walls for max sunlight. That I can close with shiney ceiling and and window blackout curtains or partly obscure with lighter ones.
I’ll have light portal holes in ceiling (between clear roof and work area) over the south end greenhouse, and place triple layer clear thin plastic trays over them as needed to control heat and topward plant sun that way. I’ll cover rest of ceiling (not the roof) with 2 to 3″ rigid foam, and have foam inserts for the plastic removable windows as well.
I’ll slope the north end roof westward, and the south end southward, and use water barrels on both to collect or water lawn.
The north end is a multipurpose/fitness/spare sleeping room, and south end the greenhouse. They’ll share a wall, window and door between them which will also be highly insulated to keep summer heat out and my winter heat in.
I’m pouring a mono slab. But not sure of pro/con vs footer type. I could use the passive earth pipes idea for more air control I think. Would be best to install under the slab to feed in/out so not exposed at all. That’s my idea anyways, if slab foundation.
I may use hay bales between the house, and the two new rooms, and exterior walls, as insulation at those locations. I need to read if those bales can be treated with bug and fire deterrent. I’d like to use hemp stalk bales if possible. I think it’s hypo allergenic. Not sure if these help or make the walls more sturdy or what?
Exterior portions that aren’t windows will be stucco I think. Some wood trim to match house. Roofing will be windows and steel. Should I use steel support in roof, or wood? Wouldn’t lightly painted steel reflect the heat?
I’m pondering if I should make the addition on a short platform, like 24-30″ off ground like a big deck, or dig in with foundation. The addition yard area is level with existing house floor, so either is doable. One concern we have is heat in the summer…it can get hot and we don’t have or want A/C. So what’s best for coolness in summer? And I suppose 15×30′ deck more expensive than slab. So also a barrier perhaps.
Does anyone have any suggestions I should consider on this addition? This is my first green wing build. Would like to use best concepts with my area to maximize passive climate control in summer and retain heat for winter to help heat rest of home and provide clean garden air all winter long.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part