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Author Topic: Garage lean to ideas  (Read 398 times)

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Offline sbishop

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Garage lean to ideas
« on: April 14, 2021, 09:39:52 AM »
Hi everyone, its been a while and i'm hoping everyone is doing well. I got the ok from the boss to build a lean to on our garage and i'm looking for ideas on the layout. The only way i got approval was to build the wife a craft room within the lean to. I need a place to store 2 atv's, 4 bycicles, some bin's etc. i'm guessing i will need 2-3 divided rooms. i'm planning on removing the existing windows and incorporating them into the lean to if it makes sense, i could use one of those openings as access to the craft room. Any suggestions on the layout?

my existing walls are 10'5" and i would like the lean to be 12 or 14ft wide about 22 ft long (from the first window to the back of the garage). what size rafter would work as i get a lot of snow and this was my first year with the metal roof on the garage and it didn't slide off as the metal has a texture to it (which i liked, didn't have to clean up the snow). i'm planning on pouring a cement slab

any help is much appreciated with the layout.

Thanks
Sbishop









Offline btulloh

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Re: Garage lean to ideas
« Reply #1 on: April 14, 2021, 09:54:52 AM »
Love adding leantoís. You might as well add one on each side while youíre at it.  :)  

Your drawing looks like the new roof is the same pitch as the existing roof. With ten ft walls youíll need a lesser pitch, but youíre probably already factoring that in. Maybe even better to attach the new rafters on the existing roof rather than extending from the eaves. Lots of variables and choices.

Canít really speak to layout, but no doubt that will be driven by your needs for the new space. And your bossesí mandates.  :D

Have fun.  Canít wait to see how it evolves.
HM126

Offline sbishop

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Re: Garage lean to ideas
« Reply #2 on: April 14, 2021, 10:50:05 AM »
i've already got plans for the other side lean too, i would like to have a roof over my utility trailer. i might just get the cement post dug and poured at the same time, that way i could work away at it when i have time.

i'd rather just attach the rafters to the side of the wall and not mess with anything on the existing part of the roof, i think it will be less hassle for me. i'm thinking at the far end of the lean to there will be enough height to get the atv's in, just need to figure out what of roll up door i could install. the drawing of the lean to was just for show..i'm not a good person to draw..ha

thinking maybe something like this, that middle wall could help support to roof?






Offline mike_belben

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Re: Garage lean to ideas
« Reply #3 on: April 14, 2021, 11:02:35 AM »
Biggest thing i can tell you is that the flatter your roof pitch the more important a drip edge becomes.  A really flat pitch will have water cling, walk back up and drip on the lumber.  And as mine is nailed, i cant unfasten the tin to correct my mistake.  Flat also requires sealants to keep the melting snow from damming backward into the seams and laps. 


Dont skimp on whatever is locally the best method to prevent condensate from dripping off the interior side of the tin.  Here its a wrap of some sort but im in the south and too poor to have ever tried it but condensate underneath is a major concern.
Psalm 37:16

Offline sbishop

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Re: Garage lean to ideas
« Reply #4 on: April 14, 2021, 11:26:43 AM »
i'm planning at least a 3 / 12 pitch but i'm thinking i'll push it to a 4/12. i don't really need 8ft wall on the far end, just enough height to get the atv's in and shut the door.

if it was a 3/12 pitch and lean to is 14ft long attaching to my outside wall which is 10'5" i'm guessing my fartest wall would be approx 7ft tall (minus the width of rafter size). if i could get above 6ft i'd be happy.

but then i would have to find a roll up shed door to fit in that space.


Offline mike_belben

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Re: Garage lean to ideas
« Reply #5 on: April 14, 2021, 01:27:34 PM »
Dont discount barn doors or rail type sliders if it solves other issues.  


I cant tell you what pitch problems start at or are fixed by.  I would want @Don P  opinion on it.

I know from experience now.. That cruel teacher...  1/4" per foot has major issues with snowmeltxand edge drip.  but it beats standin in the sun and rain.  If i have no roof give me a leaky one to work with!

Psalm 37:16

Offline 69bronco

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Re: Garage lean to ideas
« Reply #6 on: April 15, 2021, 07:12:37 AM »
i'm planning at least a 3 / 12 pitch but i'm thinking i'll push it to a 4/12. i don't really need 8ft wall on the far end, just enough height to get the atv's in and shut the door.

if it was a 3/12 pitch and lean to is 14ft long attaching to my outside wall which is 10'5" i'm guessing my fartest wall would be approx 7ft tall (minus the width of rafter size). if i could get above 6ft i'd be happy.

but then i would have to find a roll up shed door to fit in that space.
It's been awhile but wouldn't a 4/12 starting at 10' leave you 6' at 12' wide?

Offline Don P

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Re: Garage lean to ideas
« Reply #7 on: April 15, 2021, 07:41:22 AM »
4" drop in every foot is 56" shorter 14' out + rafter plumb depth + door header thickness, its getting around 6-7' shorter... I think you're getting too short. Going to a minimal pitch down below is risking meltwater backup inder the transition. Myself I'd probably look at removing the metal and crawling up onto the existing roof with the transition pitch break. You can run supports from the wall up to the underside of the new rafters as they cross the existing wall to keep from overloading the existing trusses. At that point it would make sense to go with a full 8' height wall outboard if possible. Just as a reminder never tag rafters onto an overhang, dig in and support them back at the wall either on a ledger or preferably on top of the existing wall.
The future is a foreign country, they will do things differently there - Simon Winchester

Offline mike_belben

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Re: Garage lean to ideas
« Reply #8 on: April 15, 2021, 07:47:14 AM »
Don whats the issue with sistered overhang rafters?
Psalm 37:16

Offline Don P

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Re: Garage lean to ideas
« Reply #9 on: April 15, 2021, 07:53:57 AM »
Snap, whump  :D
The future is a foreign country, they will do things differently there - Simon Winchester

Offline mike_belben

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Re: Garage lean to ideas
« Reply #10 on: April 15, 2021, 09:04:22 AM »
i sistered on my lean-to extension this year.. SYP 2x6s with a full square of overlap.. so maybe 5.25x5.25 ish.. and i think 6 ribbed nails each from two directions, they were C clamped in place real tight first to get them on line with the string.  no light gap in the coincident faces.

 once the floor is poured im gonna put a framed wall under the lap of the two rafters and remove the carry beam of the first segment, thats about 8 inches away at present.  the only goofy thing is theres gonna be some odd snowblocking just hanging around randomly.  i didnt initially think i could get the grade low enough and draining to have any pitch on a 12' extension but its working out well enough.

smiley_swinging_board

i put hurricane ties from beam to rafter on each one, with every single hole filled with #10 galvy nails, just incase you ever pop in and scrutinize someday.  i dont wanna catch too much FF flak on my retired hobo camp.  ;D



smiley_inspector
Psalm 37:16

Offline peakbagger

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Re: Garage lean to ideas
« Reply #11 on: April 15, 2021, 09:38:33 AM »
To ruin your day, structural code usually requires that if you go with a shallower pitch on the lean to you create a low spot that can be a high snow load area. I do not claim to be a structural PE but I think the lower roof needs to be structurally sized for a higher load than the primary roof. It may be 30% increase but its been awhile. 


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