Slabs laid ready for grouting

Enhance your property by laying a new patio – part #5

Slabs laid ready for grouting

With the ground levelled, falls going the right way around the property and the MoT type 1 spread over and compacted with a petrol plate the slab laying is now well under way.

Slab laying well under way
Slab laying well under way

The cement was mixed with a 4 to 1 sand to cement ratio and some plasticizer was added to aid workability and the whole mix was made up in an electric cement mixer.
Cement mixer setup under gazebo in case it rains
Cement mixer setup under gazebo in case it rains

When laying the slabs the mortar bed was built up a couple of centimetres above the height that was needed to allow for the slab to be levelled once put in place.
Cement mortar bed waiting for the slab to be laid
Cement mortar bed waiting for the slab to be laid

The slabs were set a few millimetres above the edge of the channel drain and because the slabs had a waney edge they were set back at least 10 millimetres from the drain itself.
Channel drains taped up ready for grouting
Channel drains taped up ready for grouting

A rubber mallet was used to tap the slabs down in order to level them and a spirit level was used to make sure the slab was level with the surrounding slabs and also that the fall on the slab was going in the right direction. The cement was checked to make sure that there were no voids under the slab. On the smaller slabs to borrow a phrase from the tiling world the slabs were “back buttered” with styrene butadiene copolymer or SBR for short to aid adhesion and stop them from popping up when trodden on although this will be mitigated by the grouting process.
Small slabs back buttered with SBR to aid adhesion
Small slabs back buttered with SBR to aid adhesion

Once the slabs were laid they were allowed to set for a couple of days. It was time to start the grouting process. The channel drains were taped up to protect them from the grouting process. A gunnable cement mortar grout mix was being used. The mortar being used has structural properties to give the overall patio strength once all the bedding mortar and grout have set fully after a few weeks. The mortar was mixed with the right amount of water in a bucket using a mixing paddle.
Mixing gunnable grout mortar using paddle mixer
Mixing gunnable grout mortar using paddle mixer

Once the grout mortar had been mixed properly it was placed into the mortar gun with a grout mortar piping bag having had the nozzle cut off to allow the mixture to flow easier. The mortar grout mixture in this case is fairly runny anyway and flows easily.
Grout piping bag
Using grout piping bag to fill grout gun

The grout was applied into the slab joints after well watering the joints and mopping up any standing water. The grout was allowed to set for a couple of minutes before being struck off with a grout strike. A sponge was used to wipe off the excess from the top of the slabs being careful not to rake out the grout from the joint.


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