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Adding a 24'x12' Lean-To

madosta

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Joined
Sep 4, 2012
Messages
807
Location
Michigan
I'll try and not confuse you without any pictures or diagrams yet.

I have an existing block garage, hip roof with a falling down wood lean to. It was basically tied right into the fascia and has rotted away, there's also a valley that runs into the back corner or a chimney that is rotting away. I plan on removing the chimney.

--- The Lean To ---

Will be 24' along the block wall, 12' from the block wall out. I plan on using 16' 2x6 for the rafters on 16" centers.

I will be tying the high end into the existing roof above the block wall and re-roofing the entire thing.

(4) 4x6 posts at 8' apart and maybe another one for a 6' sliding door.
2x8 double header tied to the top of the posts.

Do I need a rat wall?

Roof will be either OSB or plywood and asphalt shingles. Either one better?

I want to use steel siding, don't know how to cut it yet.
I need J-channel, 1 corner, and then the drip-edge flashing for the roof to steel conversion.
Don't know how to build the door yet.
Have to figure out how to side up to the header where the track will be.
Want clay/tan/beige siding - with white corners and channel?
Nails vs screws to secure?
2x4s every 2 feet as nailers?

- Is there a book for this sort of thing?
- Would some diagrams help?

I had a builder come out and quote me $7150 to do the entire thing. I laughed. I cant see more than $3500 in materials. I have friends, and beer, and have no real time constraints. If it gets done next spring, it gets done. I would love to have it done before snow, but not for that price.
 
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rburke65

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Joined
Nov 10, 2007
Messages
12,349
Location
Canfield, Ohio
What I have always been told, a simple rule of thumb, is materials and labor will be about the same. So....that quote is in line if you figured $3500 in materials.
 
OP
M

madosta

Well-known member
Joined
Sep 4, 2012
Messages
807
Location
Michigan
What I have always been told, a simple rule of thumb, is materials and labor will be about the same. So....that quote is in line if you figured $3500 in materials.

Interesting. I figured labor would be a big chunk of it, but it's just not viable for me at this point. I need more construction friends!
 

Shocker

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Joined
Nov 23, 2008
Messages
2,028
Location
Olympia, WA
Here are some things I did. My shed is 20x9.

This might not apply due to the way your building is constructed. I used trusses instead of rafters. The pitch is 3/12.

2urko0h.jpg


I don't have the same frost line issues you have. So I just dug mine down about 18" set on the posts.

5519pl.jpg


The sort of finished product.

289yd6v.jpg


I ended up pouring a slab (tying it to the main shop)

30u2qtt.jpg



I ended up enclosing the whole thing and turned it into a woodshop. I need to dig up the photos of the woodshop build if you want to see how I did that. Nothing special.
 
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madosta

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Joined
Sep 4, 2012
Messages
807
Location
Michigan
I like it! It looks like you used a hurricane tie or something to hold the truss/rafter to that header board? (My terms are wrong probably)

I like that footing. I was thinking about digging post holes and putting > 4' into the ground and a bag of quickrete.

I will be enclosing it at some point with steel. The quote for $7150 didn't mention anything about steel, so I have no idea why it was so high.
 
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Shocker

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Joined
Nov 23, 2008
Messages
2,028
Location
Olympia, WA
Sort of on the hurricane ties. They are Simpson truss/rafter brackets. Fairly cheap and reliable so I just used them for both sides of the truss.

You will need to go down that 4' to get below the frost line in MI. I dug mine and put in about 3" of gravel. Then the concrete pier leveled out.

When I enclosed it, I just built the walls (they are just to hold the siding etc. Not supporting the roof. and covered with T1-11. I will find the pics.
 

kyles974

Well-known member
Joined
Aug 22, 2010
Messages
881
Location
Florida/Alabama
I forgot how leanto where built up in MI. (lived there for 20 plus years)
Now live in FL. I about crapped my pants when I saw the pic. Very strong and well built!

(no snow loads here, I crapped when I first moved here and saw a lean to....lol)
 
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madosta

Well-known member
Joined
Sep 4, 2012
Messages
807
Location
Michigan
Well here's my design.

12' from block wall out.
24' along block wall.
9' inside height on existing rafter (knee wall block to sill/ledger)
< 7' outside height at fascia.
16" oc 2x6
16" oc 2x4 wall, double header/plate
Hurricane ties
1/2" osb decking
Asphalt shingles
T-111 siding.
 

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