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Question on using concrete forms

Old 11-09-2011, 12:51 PM
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Default Question on using concrete forms

I have to build some small 3' high retaining walls on the rear property line of some city lots I'm about to build houses on. They have a few small jogs and each of the 6 lots are about 18' wide. To save time instead of building wood forms I was thinking about using 2x12's as forms for the footers and then purchase some used 5'x 30" foundation forms. I want to turn them 90degrees and tie them together somehow. I know I will be using them the wrong way but with a little modification and bracing will this work or should I try and find some 3' high forms?

Thanks

Brian
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Old 11-09-2011, 12:55 PM
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better put some dead men in those walls
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Old 11-09-2011, 01:10 PM
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sounds by your description, that you are building 6 walls, independent of each other, 3' tall x 18' long.

How thick are the walls?

Form ties and bracing are not a guesstimate, the form guys have made it easy on us to brace and tie correctly as long as we give them the proper information.

laying forms down will work with some forms but not all forms, your forms turned 90* will only produce 30" of height, and 5' of length per form. I don't know of any forms this size but you will need to put ties on the bottoms and tops instead of sides since your turning them.

I would suggest maybe renting some steel ply forms, 2' wide x 3' tall. you can literally build each wall within hours and pour them. If your in Philly, there are some rental companies there for such things that will only cost "hundreds" to rent.
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Old 11-09-2011, 01:58 PM
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Originally Posted by Mike Boehler View Post
I would suggest maybe renting some steel ply forms, 2' wide x 3' tall. you can literally build each wall within hours and pour them. If your in Philly, there are some rental companies there for such things that will only cost "hundreds" to rent.
+1

Some steel ply symon forms with snap ties, few whalers, strong backs and bracing...most rental companies will provide a drawing and instructions at no cost and very quick and fairly simple.
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Old 11-09-2011, 02:30 PM
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Originally Posted by Coco Crazy View Post
+1

Some steel ply symon forms with snap ties, few whalers, strong backs and bracing...most rental companies will provide a drawing and instructions at no cost and very quick and fairly simple.
Ditto that!
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Old 11-09-2011, 03:43 PM
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Thanks guys. I'm going to do this in a few sections over a few weeks. I'll call around to a few more rental companies. The first one that I called it was almost the same price to buy one used 20' section with assorted sizes and corners as to rent it for two weeks.
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Old 11-09-2011, 04:33 PM
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Are you in Philly proper or outside the city

This place has what you need but it may be a bit of a drive. I rent from them often when I need more than I own.

I think the rental rate is about 5% of retail per month.

AH Harris
301 Hartle Street
Sayreville NJ 08872

Phone: (732) 651-7822


If your in philly metro,


Call these guys





Dayton Superior Corporation, Symons
200 King Manor Drive
King Of Prussia, PA 19406-2540
Philadelphia, PA-NJ Metro Area
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Old 11-09-2011, 04:48 PM
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not sure if the 5' x 30" forms are made to put loop ties thru the bottoms and tops. Even if they are, your tie spacing is then 5' on centers. not good. just rent some symon form that are 3' high x 2' wide. Ties 12" up from bottom and say 6" down from top. The wall ties will be at 2' spacing or in between each panel. add walers and kick/brace the tops. Alternately, build wood forms with 3/4" ply and vertical studs at 16" on center, top and bottom plate. Use "snap ties" and waler clamps at same spacing as symons, roughly. don't forget to tapcon down a 2x4 bottom plate to set Symons forms on.
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Old 11-09-2011, 08:24 PM
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Mike... Thanks for the info. I will call them tomorrow. I'm in downtown Philly so KofP place works.

Boataholic..Yeah I see what you mean by the 5' spacing. I have built a ton of wood forms for concrete. Thats why I'm thinking about using the forms. Right now time is something I'm seriously lacking so I'm not as concerned if it cost a little more.

I've also used Hilti drop in ancors with bolts to secure wood forms to existing concrete. Works great and a 1/2" Hilti drop in ain't going anywhere.


Thanks everybody for your help. I also have no plans on doing the actual foundations myself. I'm leaving that to the Pro's. I'll be sitting back with my GC hat on telling them what they are doing wrong. LOL
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