Greentree can create interesting and unique concrete by design or by adding colour and texture to it; this can generate some amazing patterns.
Regular broom finish concrete does not need to be sealed. However, all other kinds of concrete (stamped, exposed, etc) need to be sealed before the first winter, then again the next year and every three years thereafter. If you feel the concrete is too slippery then sand can be spread on the concrete prior to the sealer being applied thus creating a gritty texture.
On concrete products, it is normal to see a white powdery substance on the surface: this is called efflorescence – it is salt leeching through the concrete. This will in no way effect the integrity of the concrete and can normally be washed off however if there is any difficulty, there is efflorescence cleaner available.
Cracking in the concrete is normal and should be expected however the crack should not separate to form gaps. Should you have a gap formed, it is recommended that you clean the crack then fill it with concrete crack filler prior to the next winter.
Cleaning can be done with a pressure washer and if needed, soap or any other concrete cleaner can be used.
If the concrete sinks, we recommend having it mud jacked: this is a process by which concrete is pumped underneath the slab which can then raise the slab back into position without damage.
A one-year warranty exists on poured concrete for any cracking that occurs outside of the expansion joints; cracks will be filled and sealed.
Greentree is not liable for any chipping, discolouration, and/or disfiguration of material that may occur after installation. This includes damage from de-icing salts or other products administered.
Frequently Asked Questions
Q: How come I always see cracked concrete?
A: Concrete is very hard, but not very flexible. Therefore, when the ground freezes and thaws it can move the concrete forcing it to crack as it cannot flex. Greentree minimalizes the size and visibility of cracks by installing rebar every 18” in both directions. While properly installed concrete will still crack, the rebar will prevent the crack from expanding or shifting.
Q: Is it possible to install concrete that does not crack?
A: Greentree does offer a crack free concrete through the use of piles and void form. This has significant extra cost and is generally not considered cost effective in most applications.
Q: Is stamped concrete painted?
A: Stamped concrete is coloured with a 2 part chemical process! The first colour is added to the concrete mixture prior to being poured and creates a base colour that permeates throughout the concrete. The second colour is then applied prior to stamping, this gives a variated colour and is what makes the stamp look realistic!
Q: What is “brushed concrete”?
A: Brushed concrete is just like a city sidewalk! It gets its name from quite literally being brushed with a broom. The bristles of the broom create grooves which is done to increase traction! This type of concrete does not require sealant.
Q: What is “stamped concrete”?
A: Stamped concrete is concrete that has colour additives, and receives a stamping process with a pattern to replicate stone, tile, or even wood, before the concrete hardens. It is finished with a sealant to increase the beauty and lifespan!
Q: What is “exposed aggregate concrete”?
A: Exposed aggregate concrete is a special blend of concrete that uses smaller aggregate (pebbles). It is poured just like regular concrete but it receives a retarding agent that slows the curing along the surface. Once the pour is mostly dry, the top of the concrete gets washed off leaving the nice pebble look, it then receives a sealant to secure the pebbles and increase the colour!
Q: Do I need to seal my concrete?
A: Other than brushed concrete, all concrete surfaces require sealant, however the first sealing is included as part of the installation process.
Q: Do I need to reseal my concrete?
A: Sunlight, as well as traffic, will wear down the sealant. The sealant protects the finish of the concrete, if not sealed, exposed aggregate concrete will lose the aggregate, and stamped concrete will flake/chip off. Depending on the site conditions you will need to reseal your concrete every 1-3 years.
Q: Is it true that I’m not supposed to use salt on sealed surfaces?
A: Yes, unfortunately, salt eats away at sealant making a “patchy” look. If you put salt on your sealant it will be difficult to get rid of the “patchy” look. We recommend using sand for traction, and deicer can be used to melt ice however it is important to use environmentally safe deicers that won’t damage sealant.
Q: Are exposed aggregate and stamped concrete slippery?
A: No, stamped nor exposed aggregate concrete are not slippery themselves. However, the sealant on the concrete can be! There are different kinds of sealers that can be applied, including sealers with a granular additive that will greatly increase traction. These may be an additional cost.
Q: Can a retaining wall be made with stamped concrete?
A: Unfortunately, the only portion of the concrete that can be stamped is that which does not have a form on it. This means only the top of concrete can receive a stamp, the sides of stamped concrete are smooth and single coloured. This is the same for steps.