Enhance your property by laying a new patio – part #6

Grouting patio joints

One thing you don’t want when you’ve just grouted your patio is to have torrential rain in the next 24 hours which is exactly what we got. The grout had time to harden to a reasonable state but the excessive rain did cause what is known as effervescence where the salts bubble up to the surface and cause white staining on the grout. The grout is supposed to be a charcoal gray colour. We will have to let the grout harden fully for a few weeks and then deal with the discolouration by applying an acid effervescence cleaner to correct the problem.

Salts effervesce from grout
Salts bubble up and effervesce from grout due to heavy rain directly after application

Where the ground level had been graded and lowered below the concrete surrounding the fence posts this was structurally improved using bricks and a cement render made up of 3 parts sharp sand to I part cement and some SBR to aid the mixture sticking to the concrete.

That is the patio at the side of the house pretty much complete except for finishing and now it was time to move onto the patio round the back of the house.

The first job was to sort the frame that fits onto the foul sewer inspection chamber. This will have a slab insert in order to minimise the visual impact of the inspection chamber access cover. The inspection chamber in this instance is a Osma Drain 4D960 inspection chamber and the frame being used is a Clark Drain Recessed cover. The spigot on the Clark Drain allows for different internal diameters of inspection chamber but does not offer much adjustment up and down so the spigot from the old Osma Drain frame cover 4D961 was cut off and the first ring of the spigot from the Clark Drain was also sawn off. This allowed the spigot from the Osma Drain to fit inside the Clark Drain spigot and to be glued using PVC pipe weld adhesive giving a very strong and airtight seal and also allowing some vertical adjustment when setting the frame in place.

Spigot sawn off from Osma Inspection Chamber
Spigot sawn off from Osma Inspection Chamber
Osma Drain spogot glued into Clark Drain spigot
Osma Drain spogot glued into Clark Drain spigot

Next the riser for the inspection chamber needed to be cut down to allow for the height of the cover frame. The riser was marked round with tape to the correct height and then cut with an oscillating multitool. The burrs were cleaned up with a coarse emery cloth.
Inspection chamber riser marked ready to be cut
Inspection chamber riser marked ready to be cut

The height around the riser was built up with type 1 and tamped down then mortar was trowelled into place around the riser and the frame set in place to the correct height of the surrounding slabs and with a slight fall matching the rest of the patio. The slabs around the frame were cut using an electric tile cutter which had a water tray for the blade to suppress dust. Also water was dribbled onto the slab while it was being cut. The operators wore face guard, face mask and ear defenders. Type 1 was added around the frame and tamped down and then the slabs were set in place.
Inspection chamber access cover frame set in place
Inspection chamber access cover frame set in place


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