What kind of wood do you use for expansion joints in concrete?
redwood
Clay expands when it gets wet and shrinks when it dries. As the ground moves, so do the concrete slabs. The wood between the slabs not only looked good when it was new but also absorbed the stress of soil movement. It’s a good bet that your expansion joints are redwood.
What do you use to fill expansion joints in concrete?
Expansion joints must be sealed with a flexible sealant, like QUIKRETE® Self-Leveling Polyurethane Sealant or QUIKRETE® Non-Sag Polyurethane Sealant…or an expansion joint strip, to prevent water from penetrating the joint and deteriorating the sub-base.
Can expansion joints be replaced?
Dirt, weeds and grass can fill in these areas, prompting herbicide use or a letter from the homeowner’s association. There are different methods to replace expansion joints. 1. For the doityourselfer, there is a product which comes in a caulking tube which is used with a closed cell foam rod or sand below it.
What is the best expansion joint for concrete?
Silicone provides an excellent alternative to the three expansion joint fillers above, and for a few reasons. First and foremost, it is flexible and durable, allowing it to accommodate the natural expansion and contraction of the slab without cracking or breaking its seal.
Can you cut expansion joints in old concrete?
Control joints can be “created” while the concrete is being poured by using a tool to make the joint. These joints can also be cut into the slab once the slab has cured enough to prevent chipping during the cut.
How do you seal a gap between concrete and wood?
I recommend using an exterior silicone formulation for concrete or a high-quality polyurethane sealant. Both will stick well to the wood and the concrete. Acoustical sealant is a better, albeit slightly more expensive, option. Caulk often works best at a slab-wall transition.
Can you caulk between wood and concrete?
One of the best uses for silicone caulk involves filling the gaps between concrete and other materials, such as brick, wood or metal. Silicone caulk adheres well to all of these materials, and because it has elasticity, it won’t crack or break when materials like wood expand in response to environmental conditions.
What removes timber formwork from concrete?
- Step 1: Wait for the concrete to set. Wait the required time for the concrete to harden and gain enough strength to support itself.
- Step 2: Start from the top. Remove the highest forms first.
- Step 3: Remove the stakes.
- Step 4: Remove the sides.
- Step 5: Recycle or dispose of formwork.
Can you leave wood forms in concrete?
The forms or “molding” that holds the concrete in place until it dries should be left alone for at least two days to ensure that the concrete is completely dry. If the forms are removed too soon, the concrete can begin to sag, crack and collapse, especially if conditions like temperature affected its strength.
Can you add expansion joints after concrete is poured?
You can install concrete expansion joints before or after the concrete is laid.
How deep should expansion joints be cut in concrete?
A good rule of thumb is to make your cut ¼ the thickness of your concrete. If ¼ of your slab’s thickness, doesn’t reach 1” make sure you still cut at least a 1” depth.
How do you remove wood forms from concrete?
This is sometimes done on large projects where forms are reused in another part of the pour.
- Remove the stakes and braces holding the forms in place.
- Pull nails connecting the form pieces at the corners using a hammer or wrecking bar.
- Pull the forms away from the slab.
How long can you leave wood forms on concrete?
When can I remove wood frame from concrete?
Walls and columns can be removed after about 24-48 hours
- Walls and columns can be removed after about 24-48 hours.
- Slabs, with their props left under them, can typically be removed after 3-4 days.
- Soffits, with their props left under them, can be removed after one week.