How Much Jointing Compound Do I Need?

Of course, there’re product calculators from the brands themselves to calculate how many tubs or bags of jointing compound do you need based on the details you enter about the patio, slab, and joint size but you just get a number or quantity required from those calculators.

The quantity that the calculators will tell you is the approximate quantity, and will never find the exact quantity of jointing compound needed to complete a particular job unless you do it and then calculate how many tubs did it take. However, we’ll see some more details than the calculator will tell you on how much jointing compound is needed in the post.

On average with various brush-in jointing compounds on the market, you can expect to get between 1/2 and 1 square meter pointed per 1 kilo of jointing compound. It can vary a bit depending on the size of the slabs and also the width and depth of the joints.

Slab size can definitely affect the quantity of jointing compound required because small slabs mean more joints to point and more jointing compound as well. For example, a 50 square meter patio would need 50 kilos of jointing compound maximum (as we just saw 1 sq. m./1 kilo on average), but if the patio is made of small flags, you may need one or two extra tubs as there’re are more joints to fill.

For instance, 300X300 slabs require jointing compound in double quantity as bigger slabs like 600X600. Also, if the patio slabs are of random sizes, generally more jointing compound is expected to require.

The depth and width of the joints play a huge role in how much jointing compound is needed for pointing. For example, two patios of the same size with the same size slabs and the first have 10mm and the second has 20mm gaps so, if the first patio requires 10 tubs of joining compound, the second patio would need 20 tubs.

also read: Easyjoint for Porcelain: Why avoid brush-in jointing compounds?

How many square meters does each tub cover & how much jointing compound do you need?

EasyJoint Coverage

EasyJoint covers between 5-10 square meters per tub (12.5 kg). For example, to point a 100 m2 patio you will need between 10-20 tubs of EasyJoint depending on the slab and joint size.

Sika FastFix Coverage

Sika FastFix covers between 7-15 square meters per tub (15 kg). For example, to point a 100 m2 patio you’ll need between 7-15 tubs of Sika FastFix jointing compound depending on the size of slabs and joints.

Joint-It Coverage

Joint-It covers between 10-20 square meters per tub or bag (20 kg). For example, to point a 100 m2 patio you will need between 5-10 tubs of Joint-It depending on the slab and joint size.

Pavetuf Coverage

Pavetuf covers between 7-15 square meters per tub (15 kg). For example, to point a 100 m2 patio you will need between 7-15 tubs of Pavetuf depending on the slab and joint size.

Marshalls Weatherpoint 365 Coverage

Marshalls Weatherpoint 365 covers between 7-15 square meters per tub (15 kg). For example, to point a 100 m2 patio you’ll need between 7-15 tubs of Marshalls Weatherpoint 365 depending on the size of slabs and joints.

Nexus ProJoint Fusion Coverage

Nexus ProJoint Fusion covers between 7-15 square meters per tub (15 kg). For example, to point a 100 m2 patio you’ll need between 7-15 tubs of Nexus ProJoint Fusion depending on the size of the slabs and joints.

Jointing Compound	Quantity/Tub	Coverage/Tub	Price/Tub
EasyJoint	12.5 kg	5-10 sq. m.	£38-£41
Joint-It	20 kg	10-20 sq. m.	£37-£43
Sika FastFix	15 kg	7-15 sq. m.	£20-£28
Pavetuf	15 kg	7-15 sq. m.	£36-£49
Marshalls Weatherpoint 365	15 kg	7-15 sq. m.	£53-£55
Nexus ProJoint Fusion	15 kg	7-15 sq. m.	£37-£50

To be on the safe side, you can get one or two tubs extra if you have a large job and are unable to estimate how many tubs you will need. You can always return the tubs that are left unopened for a refund after the job is completed.