Hello everyone,
Our house is now 6 years old, and we want to replace the patio slabs (at the time, we installed plain concrete slabs for cost reasons). Now, we want to install porcelain tiles on top. A landscaper inspected the area and looked underneath the slabs. He found that the layer of grit is quite thick, around 8-10 cm (3-4 inches) at the spot he checked. Below that is the crushed stone layer, but we don’t know its thickness; it might be thinner.
The landscaper recommends removing and rebuilding the base because there is too much grit used. Since the new tiles are about 2 cm (1 inch) thinner, adding 2 cm (1 inch) of grit on top would mean a total of about 10-12 cm (4-5 inches).
Is that really too much? Why would this be a problem?
Our house is now 6 years old, and we want to replace the patio slabs (at the time, we installed plain concrete slabs for cost reasons). Now, we want to install porcelain tiles on top. A landscaper inspected the area and looked underneath the slabs. He found that the layer of grit is quite thick, around 8-10 cm (3-4 inches) at the spot he checked. Below that is the crushed stone layer, but we don’t know its thickness; it might be thinner.
The landscaper recommends removing and rebuilding the base because there is too much grit used. Since the new tiles are about 2 cm (1 inch) thinner, adding 2 cm (1 inch) of grit on top would mean a total of about 10-12 cm (4-5 inches).
Is that really too much? Why would this be a problem?
C
Caspar202022 Jun 2016 12:42But they are thinner. And the original poster wants (or needs?) to maintain the same finished ceiling height.
A
Andreas200122 Jun 2016 13:31Hello everyone, thanks for all the contributions. I just remeasured in two spots, and there are about 10 cm (4 inches) of gravel under the slabs. Since the new ones are thinner, an additional 2 cm (0.8 inches) would be added to compensate. So, in total, there would be about 12 cm (5 inches) under the FSZ slabs.
The landscaper mentioned that this might increase the risk of the slabs shifting. I should also add that we have already experienced shifting with the concrete slabs, but that could also be due to the soil settling again at the edges.
@Nofret : is that just a personal opinion, or are there specific arguments behind this statement?
The landscaper mentioned that this might increase the risk of the slabs shifting. I should also add that we have already experienced shifting with the concrete slabs, but that could also be due to the soil settling again at the edges.
@Nofret : is that just a personal opinion, or are there specific arguments behind this statement?
Here are a few statements from the internet (not from forums) but from landscaping contractor websites:
Installation on gravel or crushed stone. The gravel must be built up to about 20 cm (8 inches). Gravel or crushed stone is suitable for this type of installation. A minimum slope of 2% is required here to ensure proper water drainage.
Or:
Porcelain stoneware patio tiles about 2 cm (0.8 inches) thick combine the appearance of natural stone, concrete, or wood with the durability of porcelain stoneware, making them an ideal surface for patios. Visually, porcelain tiles closely resemble the natural materials they imitate and are at the same time frost-resistant, slip-resistant, scratch-resistant, UV-resistant, and require minimal maintenance and cleaning effort.
Due to their high weight, these patio tiles can be installed loose on crushed stone, drainage mortar, or on a firm base even with loose installation on pedestal supports.
Installation on gravel or crushed stone. The gravel must be built up to about 20 cm (8 inches). Gravel or crushed stone is suitable for this type of installation. A minimum slope of 2% is required here to ensure proper water drainage.
Or:
Porcelain stoneware patio tiles about 2 cm (0.8 inches) thick combine the appearance of natural stone, concrete, or wood with the durability of porcelain stoneware, making them an ideal surface for patios. Visually, porcelain tiles closely resemble the natural materials they imitate and are at the same time frost-resistant, slip-resistant, scratch-resistant, UV-resistant, and require minimal maintenance and cleaning effort.
Due to their high weight, these patio tiles can be installed loose on crushed stone, drainage mortar, or on a firm base even with loose installation on pedestal supports.
Mycraft schrieb:
Let him just add 2cm (1 inch) of fill and level it... what could go wrong? Don’t fall for that nonsense about distance... this is just a scam to make money... Dangerous ignorance!!!
According to ATV guideline 18318, the bedding layer should be at least 30mm (1.2 inches) and at most 50mm (2 inches) compacted!
Mycraft schrieb:
Here are some statements from the internet (not from forums) but from landscape gardening websites:
Installation on gravel or crushed stone. The gravel base must be about 20cm (8 inches) thick. Gravel or crushed stone is suitable for this type of installation. A minimum slope of 2% is necessary to ensure water drainage.
Or:
Porcelain stoneware patio slabs, about 2cm (0.8 inch) thick, combine the appearance of natural stone, concrete, or wood with the durability of porcelain stoneware, making them an ideal patio surface. Visually, porcelain stoneware tiles closely resemble the natural materials they imitate and are also frost-resistant, slip-resistant, scratch-resistant, UV-stable, and require minimal maintenance and cleaning effort.
Due to their high weight, these patio slabs can be laid loose on crushed stone, drainage mortar, or on a firm base with loose installation on pedestal supports.
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