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Old 12-04-2011, 09:09 PM   #16
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Originally Posted by Joe Carola View Post
The girder in the basement has nothing to do with the drawing you have. The way you have the side view of the drawing will not work unless you have walls underneath the new ridge. Is that dormer going the entire length of the house? I've done many of these dormers. There are many ways to frame them. You have to provide a floor plan of the rooms on the second floor. hat will tell how the walls carry up to support the new ridge and support the existing front rafters.

The way you have it draw with no walls carrying up can be done if you run ceiling joists from the dormer top plate back tying into the existing rafters.
The drawing i did was something i threw together last night before posting, to try to clarify my situation. There are a couple of bearing walls, my previous post with the floor plans better show this. the dormer is going to stretch to the edges of the house, but i am going to keep the existing gable end trim to break up the siding a bit. Also i am thinking of creating a eve off of the bottom of the shed dormer, so that it looks stepped back a bit, and will provide a little rain coverage, and a place for my ventilation. I've never done a shed dormer before, i have don't a few dog house dormers. A friend who has done a lot of this is supposed to be helping me, but suddenly he seems to have disappeared and not return calls... Wishing i just hired an architect from the beginning... lesson learned.

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Old 12-04-2011, 09:13 PM   #17
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That's what City or as the case here, both City and Private Building Inspectors do. They check compliance with codes, and structural requirements are just one aspect. The codes also cover things like waterproofing of bathrooms, light & ventilation and many others. Andy's spot on, get a designer.

He/she will recommend whether you need a structural engineer as well. By the sound of it, you need both. Can you calculate present and future loads accurately? If not, how do you expect people on this forum to advise you if your beam size is adequate when they haven't seen your house or a full photo explanation of all the conditions, and what loads are transmitted to the existing structure below. Moreover, even an architect or designer would or should hesitate to recommend something structural, and in today's litigous environment, it wouldn't be prudent to do so.

That's why you are rubbing the inspector the wrong way, expecting him to design it for you.

Cheers! from Oz
i was never expecting him to design it for me, i never asked him for anything. He just told me that i needed to provide him with engineer specs for the existing girders before he would approve any type of vertical addition. SO i am trying to find out if what i have is sufficient BEFORE bringing it to him. Ive tried to talk to him, but he didn't want to give me 2 mins of his time. :-/
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Old 12-04-2011, 10:04 PM   #18
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He just told me that i needed to provide him with engineer specs for the existing girders before he would approve any type of vertical addition.
This is what I don't understand, The only extra weigh that I see is on the exterior walls, nothing new loading the girt.

Except for maybe a couple of partition walls on the attic floor?

Andy.
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Old 12-04-2011, 10:19 PM   #19
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That's my whole point. Im not adding any load to the girders... I guess maybe the code in 1950's isn't as strict as it is now, so he wants me to bring the whole house up to code... Seems a bit ridiculous
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Old 12-04-2011, 10:55 PM   #20
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I guess maybe the code in 1950's isn't as strict as it is now, so he wants me to bring the whole house up to code.
Ah, now the plot thickens, the Building Department has the right by law to ask you to have the structure brought up to present code when you make a significant enough change.

If the price of engineering is just too high then do as I said before and do without some aspect of the build, pay for the engineering and wait to build the last part,

Engineering really should not be all that much, I think I could get my engineer here in Cal. to do this for about $1400.00. Now that is on the high end but you would know the building is safe.

Andy.

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