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G'day Epolkowski Thanks for your detailed reply to my initinal query. As a general observation it appears the building practices within the US involves a wide variety of bar chairs. Again many thanks.

G'day boffintech I have spoken to our local rebar suppliers, both small and large outlets, and queried the ratio of sales between plastic and metal bar chairs. The general opinion was for very 1000 bags of plastic bag chairs sold they will sell less than 10 bag of metal bar chairs. I can...

G'day boffintech Thanks for the information. The problems I have encountered with the plastic tipped metal bar chairs is the tendency to tip over due to the small footprint plus they are only designed to carry one bar. The plastic chairs are combinations where both top & bottom steel of the...

G'day Boffintech Within Australia plastic bar chairs are used extensively in suspended slabs, beams and columns. I have never experienced any failure of the plastic bar chairs, nor have I ever heard of a failure. The plastic bar chairs are more than capable of supporting both materials and men...

G'day Civilperson Thanks for the confirmation. I found it hard to believe plastic bar chairs would not be commonly used on projects in States. Plastic / metal bar chairs are used extensively thru Australia.

Good Morning Richard Thanks for your prompt reply to my query. Can you advise if the use of plastic bar chairs within the States is common practice.

I have recently received information from an associate whom has just returned from the 2008 ConExpo. During the Expo he was approached by several people enquiring as to the extruded plastic rebar support ( bar chairs ) he was he using in an exhibit. He was queried as to where he obtained these...

G'day Ted Thanks for your information and prompt reply to my query. Regards Alan

My business partner has designed and patented a pneumatic tool to tie reinforcing bar as used in the construction industry. However we do not know if we are require to comply with any American Standards or Codes in regard to pneumatic tools.

G'day Daniel The process we have developed utilizes a press metal metal V shaped clip to clamp or clinch the bars together. We made a choice not to use wire as there are existing tools on the market, both electric and manual to compete against. Strength and reliability of the ties are not an...

G'day Dinosaur, Thanks for the reply. There is no minium requirement within the Australian to the number of ties used. Just as long the rebar maintains its shape and position, of course the supervising engineer has the final word on the matter but I have never had to many problems to date...

G'day Richard Thanks for the information, believe it or not, but my business partner was discussing this very possibility last Friday. Thanks Alan

Good Morning Daniel Thanks for your reply. Within Australia, engineers refer to Australian Standard AS 3600 - 2001. This standard simply states "shall be supported and maintained in position within the tolerances until the concrete has harden. Bar chairs, spacers and ties shall be made of...

Are there any restrictions upon the methods,equipment and materials used to tie reinforcing bar in suspended slabs.