pony-walls perimeter on a low-slope roof
newbuilder
| Posted in Construction Techniques on
I’m in the process of putting on a low-slope roof — 1/4″ per foot — on the structure I’m building and I’m thinking ahead of the pony walls that will run around the perimeter. I ‘could’ leave a 5 1/2″ pad on the top-plate all the way around to accept a the ponywalls … building the roof just in from the outside edge. This would give me a level buildiing surface for the walls.
Would you recommend this or suggest that I simply build this sloping roof and worry about how to build the walls on a sloped surface after? (i realize a 1/4″ / foot slope aint much)
thanks –
T.
Replies
Greetings newbuilder,
Not sure if you got what you needed in your other posts so this post, in response to your question, will bump the thread through the 'recent discussion' listing again which will increase it's viewing.
Perhaps it will catch someone's attention that can help you with advice.
Cheers
- Thoreau
Assume you are talking parapet (sp?) walls around a flatt roof, (1/4 " slope) and you are right that the slope is negligible and i wouldn't even bother cutting an angle in the crips. If they want the wall levell all the way around you will have a rake in the two walls parallel with the slope.
I'd be curious if this roof is venting through the parapet walls. Often we sheet the roof, plate the walls, then driil holes in the joist bay where the air can vent out through screened openings in the wall cap.
If I understand the question right, I think your alternativeyou suggested would be more work and would than need vent jacks (not uncommon and maybe called out) but if you do have to vent the way I mentioned you would have a tuff time and I think the less penetrations on a flat roof the better.
Hey .. thanks guys.
This really does help.
nb
I would intertwine the rafters and pony wall studs. This lets you have an eave outside the PW if you want. Just make sure that the studs fall outside the rafters at the scuppers.
Pay attention to your cricket details, and, leave some ventilation in the PW.
SamT
In this location, these walls are called parapet walls.
Would ahve been good to know that this was your plan when you asked how to create a pitch for the roof. This new knowledge throws out most of the suggestions made in that thread.
I would build these balloon frame from the lower level on through and hang the roof trusses to them with a ledger.
So where are you now with the roof?
and explain to me again - are you not in an area where you need plans first before getting permits and inspections?
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So where are you now with the roof?
and explain to me again - are you not in an area where you need plans first before getting permits and inspections?
I'm in the middle of a large city, and I do have plans and a permit. But the the plans are what I'd call 'general' and, as I understand it, there are always some changes made here and there throughout the building process as long as they don't go against code. (Also, my inspector is a great guy and really likes the project and has cut me a little slack here and there as long as safety and code are not jeapardized.)I don't have parapets on the original drawings but I'm hoping to be able to put them on. I'll have to check with the building dept downtown to see if I really have to go through a major reconsideration before putting them up. For now I've decided to simply finish the roof the way it appears on the drawings and deal with the (hopefull) walls a little later before the rains come in the Fall.
I've been building this monster since Sept of '05 and on Saturday the 15th I finally stood on the first 4X8 sheet of t&g that was glued/nailed to the tgi's on the very top ... fourth floor roof ... 40 ft. up! The view is spectacular as I'm at the very top of one of the highest hills in town.
I went with building a jig and cutting 14 13 1/2 foot 'shims' to glue/screw to the tops of the tji's. It really turned out remarkably well. The entire roof is nearly on but I'm two tji's short and will pick them up tomorrow and then actually finish the roof! To me, after working for nearly two years largely alone on this, it is quite exciting. But still an eNORMous amount of work remains .. of course.
I'll be going with epdm ... think I'll go with the reinforced screwdown type as opposed to the gluedown.
I truly appreciate all the feedback!!!
nb
Too bad you don't have this planned ahead. Just plunking these walls down on top oif the roof means you will need to develope a funky way of bracing them so they don't fall over. especially hard if you get the EPDM already on first. screwdown EPDM?I suppose you mean a mechanicly fastened systemHere, one thing that would affect whether you can do the paarapet walls is height restrictions.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Too bad you don't have this planned ahead. Just plunking these walls down on top oif the roof means you will need to develope a funky way of bracing them so they don't fall over. especially hard if you get the EPDM already on first. screwdown EPDM?I suppose you mean a mechanicly fastened system. Here, one thing that would affect whether you can do the paarapet walls is height restrictions.
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It is planned ahead ... just not every tiny detail. But I do, of course, have the original plans. They do NOT include walls on top .. that was a later consideration.
You're right .. I'll have to devise a way to fasten them through that will be rock-solid.
I do believe that I'll cover with mechanically fastened epdm and then later run it up the inside of the walls.
My heighth restriction is 40 ft. But there are exceptions for various upward protrusions. The restrictions apply tot the top of the top roof joists. Then small additions like ponywalls and even a full-sized covering to an ascending stairway are permitted. In the end, this will be a wonderful and completely unique structure. Until the next Seattle quake!
nb
Sure would liketo see a pic of the building.
Just love alternative buildings.
"As if you could kill time without injuring eternity." Thoreau
Sure would liketo see a pic of the building.
Just love alternative buildings.
I'll get one up soon .. where should I put it .. in the "pics" board?
where should I put it .. in the "pics" board?
Yeah, or keep this thread going. It'll pop to the top when there's a new post. I'd like to see what the hell it is you're doing as well.
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I've never met a man that was owed as much as he thought he was.
You could just attach it in a reply in this thread.
That helps keep the posts together for nice continuity of a subject. View Image
"If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them." -Thoreau
Almost too many questions to ask.
What direction is the framing running? Are the rafters to be dimensional or trusses or what? Spacing? Pitch long way or short way? Open one side, or scuppered all around? Is this urban or rural? Is there an AHJ? What is the use of the building (residential different than commercial; storage different than shop or business)?
For self-storage buildings, three-full height walls with the last open for drainage can work very well. Sometimes "long way' is better, and sometimes "short way' is better. Most of this ought to have been worked out from whatevertake-off created the framing order.