Adding 8ft to the side of garage

[siolence]

Looking for some technical advice on the below.

I joined the site to gain some input on adding 8ft to the side of my garage so I can move the work bench/ tool storage area. Doing so will allow me to keep the current floor slab for the 64 droptop and two wheeled items.

Also in the plan is to shift the man door (yard side) closer to the extended side. then adding a 16 foot roll up door to replace the current slider facing the alley.

The garage is currently 20ft wide and 24 long. I would like to keep the left side roof pitch the same and extend the pitch on the right side. I have sketched it on graph paper and aestetically the lines are pleasing.

My question is about length of rafter run and roof support on this extension. I would say the pitch is 8/12 now

 

[readhead]

At 8/12 you are going to lose 5'4" in 8'. unless the existing wall is 12' high I think you will bump your head.

 

[Justanoldguy]

Change the pitch to something more suitable if there isn't enough headroom at the side.
This is, of course, all dependant on original wall height.

 

[readhead]

Where are you located?

 

[Falcon67]

If I get it, you'll be 28' wide when done. I would work on a rafter size using a pony wall on top of your existing wall and coming off the ridge with new rafters. Ridge to pony wall (10' span) then 8' span to the new side wall. Maybe more work but smaller lumber. Your pitch on that side would be whatever got you from the existing ridge to the new 8' wall 18' away. About 4.4/12.

 

[siolence]

I am in Seattle. The standing wall is 7? FT now. plan was to slide it out the 8 ft and that would be the new pitch. would that be too long of a span and need to support?

 

[siolence]

Ok I think I see it now. leave existing wall ends, extend up (pony wall) to support new rafter angle then carry short distance to the new wall.

 

[readhead]

Well snow is not an issue. I presume the rafters are bearing on the "standing wall". There are a lot of things going on here. If I understand correctly you want to remove half of the roof, move the wall and frame a new roof. Seems kind of complicated. I liked Falcons idea. Ofcourse you would have to install a beam to replace the wall. Another way would be to install a beam to replace the wall, frame new walls and turn the ridge over the addition and over frame on the existing roof.

 

[97dynaglide]

I have a 6/12 pitch on my garage, and did an 6' extension. I believe the pitch on the 6' came out to just about 4/12. I have 8' exactly for headroom at the wall.

Take a look here at my pics:
http://www.garagejournal.com/forum/album.php?albumid=2424

 

[siolence]

Thanks for the pics that is how I picture my idea, current size becomes the parking area and the addition holds the work area.

Many thanks to everyone for jumping in so quick

 

[Justanoldguy]

That's why in post 3, I said change the pitch.
Like this.

View media item 25510

 

[readhead]

Since you are only dealing with rain it looks like the pitch change noted above would be the best solution. You may have to move up the existing roof a bit since the wall is only 7' but it should be the easiest solution.