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Expansion Joints-Control Joints & Accessories

The following expansion joints are made to accommodate movement in concrete slabs. Fiber and Rubber expansion joints – Rubber expansion fills the joint and protects against weathering.  Fiber impregnated with asphalt is a more economical expansion joint which is easier to put into place.  Both Rubber and fiber are made in 10’ lengths.  

Foam expansion joint- Made in white off white and black, foam expansion joint holds up as well as any expansion material in the business.  Flexibility allows for making radiuses.  Foam expansion joints are also available with a ½” tear strip to allow the finished concrete joint to be caulked.

Expansion Joint cap – used over top of fiber expansion to create a void.  Once cap is removed this void is then filled with joint sealant.  Bo Metals for more info.

Zip Strip- Used to create a control crack in concrete.  This material is worked into the top of the slab ¼” of the depth of the slab ex: 4” slab, use 1” zip strip.  The sole purpose of this material is to give the slab a weak area where it will crack naturally.  Bo Metals for more info.

 See Expansion Joint cap and zip strip at Bo Metals Website

Pool Control Joint- This is a white plastic control joint, which is used in concrete.  Manufactured by Mortex this material has been used for years to provide an attractive joint in pool decks.  Today this material is being used in concrete patios, driveways etc.

Screed Joint

Screed joint- is used as a form that stays in place with a built in keyway.  The use of metal screed joint allows a contractor to form up square slabs side by side and make one large pour.  The screed stays in place and not only provides a key for the slabs, but also a control joint for the slab.  Standard sizes are made for a 4”, 5”, 6” and 7” slab.  More information is available at Bo Metals.

PVC Waterstops

 These Waterstops are made of virgin PVC and are formed  into Concrete joints during the actual pour.   The PVC Waterstop then bridges the joint between the slabs to prevent water from coming through the joint.  Waterstops are typically used in large foundation work, bridges, Dams, and wastewater treatment plants.  Waterstops are also available in TPR rubber.  More information found at Bo Metals.

 Dovetail Anchor Slot

 Dovetail anchor slot manufactured by Bo metals is used in reinforced concrete to tie the concrete wall into a masonry wall.  Dovetail is set in place in the form before pouring; the foam channel is then open at the face of the wall prepared to insert dovetails by the Mason Contractor.  More info at Bo Metals

Form Release Agents

 Cresset Chemical Company manufacturers 727  and  880VOC Form Release agents for the precast and poured in place concrete market .  The ability of 727 form release to not only give a smooth finish, but to also clean forms the more it is used make it an ideal choice for those poured wall contractors who want to save time and labor, and take care of the investment made in their forms.   Both 880 and 727 are architectural release agents that do not transfer onto the concrete after the pour is made.   More information is available at Cresset.

  Other Concrete Related items

 Nail Stakes                                              Metal Slab Bolsters

Nylon Fibers                                             Rebar Chairs