Weed-inhibiting jointing compound for firm joints


DANSAND® Firm Fix is a weed-inhibiting and ready made jointing compound for outdoor surfaces of concrete and natural stone.

When coming into contact with water, Firm Fix hardens up to a depth of approximately 1 cm in the top layer of the joint. This creates an efficient barrier for weeds and insects and results in firm yet flexible weed-freed joints on drives, patios and paths  with low levels of traffic.

Use our coverage calculator to estimate the amount of Firm Fix you need. As a guideline, please expect to use 20 kg for 5-10 m2.

Benefits at a glance
  • Weed-inhibiting
  • Firm yet flexible joints
  • Ready-made mixture
  • Easy to sweep into the joints
  • Guarantees water-permeable joints
  • Joint width: 3-10 mm
  • Effective from a joint width of 40 mm



DANSAND® Firm Fix is a ready-to-use mixture of oven-dried silica sand, cement, and binding agents. Available in neutral or anthracite colours. Can be used directly from the bag.


Frost-proof plastic bags made of PP material.


The bags can be stored outdoors during the summer. Store in a dry place in winter. We recommend a covered storage location, as the plastic foil cannot tolerate heavy rain. Open bags must be closed again.


Safety data sheets can be requested by contacting Dansand.


20 kg in frost-resistant foil bag.

Environmental information and disposal

The jointing-compound must not be classified as hazardous according to the Ministry of the Environment’s rules for classification and labeling. Residues are handed in at the recycling station. The jointing-compound must not be poured into the sewer. The content af soluble chronium IV is less than 2 mg/kg of cement dry weight. Reductive agent is active 18 months after packaging date. The authorities’ requirements for the establishment, maintenance and grouting of fortified areas may vary nationally and locally. Therefore, familiarize yourself with the applicable national and / or local regulations before starting the joint work.

Physical properties
Grain size0-1.5 mm



For joints between new or existing paving stones (concrete or natural stone). Ideal for patios, garden paths and driveways with limited traffic. Only for use on unbound substrates. Only for outdoor use. Suited for private use.

Estimated consumption: Approx. 2,0 kg/m2 at 3 mm joints. Our coverage calculator can help you calculate the amount you need.


Minimum joint depth is 40 mm. Joints can be from 3-10 mm in width.


Here’s how you do it

Paving stones are laid on a sustainable gravel and sand layer in accordance with current standards for paving work. The joint material is water-permeable like ordinary joint sand. Therefore, the base layer must also be water-permeable.



DANSAND® polymeric block paving fix is not a remedy for weeds. To prevent existing weeds from growing, all weeds – including weed roots – must be removed before grouting. Clean the joint to a depth corresponding to the entire height of the stone. This is done using a joint cleaner. You can also use a high-pressure cleaner, but be careful not to damage the coating or the sublayer. Top up the joint.



To avoid weeds and displacements in the coating, the joint must always be filled to the full height of the joint edge and be completely free of soil and other organic material. The coating is cleaned with a stiff broom and the joints are refilled as needed. Moss and algae can be removed by suitable means. Extreme weather conditions can cause white blooms in the joints and on the edges of the paving stones. However, they are usually washed off at the next rain shower. The salt deposits can also be removed by regular cleaning of the stones.



  • If you use the filling material for coloured, porous pavings, it may settle in small depressions in the stones, leading to discolouring. This can often be removed with a brush and some soap – see how in our cleaning guidelines.
  • Always prepare a test area of at least 0.5  m2 before beginning
  • The filling material will not withstand constant erosion by water
Step 1
During joint filling and during the first days of hardening, the air and soil temperature must be at least 10 ° C.
Step 2
Both the weather and the substrate must be dry for the joint to harden completely.
The joint does not withstand rain (except fine drizzle and dew) for the first 24 hours.
Step 3
Check the weather forecast before beginning to work. Mix the contents in a mason jar or a wheelbarrow so that the binders are mixed with the silica sand. Never mix the contents of more than two bags at a time.
Step 4
Sweep the filling material into the joints using a soft broom. Sweep lengthwise and diagonally on the joints until they are completely filled.
Step 5
Sweep the surface completely free of excess material. Use a soft broom.
Step 6
Compact the joints using a vibrating plate - do this at least twice. Use a protective rubber mat to protect the paving.
Check that the joint is fully compacted - use a spatula. You should only be able to press the spatula one or two mm into the joint.
Step 7
Refill if needed and sweep the paving completely clean using a soft brush.
Step 8
Moisten the joints with a garden hose with the nozzle set to fine water mist. Watering cans are not suitable. IMPORTANT! The process should be repeated after about 5 minutes. Moisten no more than max. 20 m 2 at a time. The wetting is checked by scratching up some grout. Make sure that the joint is moistened int its entire height corresponding to the stone height. Begin the process from the lowest end of the drop. Using a pointed object, check that the joints are moistened to their full depth. Be careful when watering. Do not overwater. The coating can be walked on after about 2 days and can withstand light traffic after about 3 days (in dry weather and about 20° C)

Additional information




Product designation:


Item number:



Anthracite, Nature


Anthracite – 600411, Nature – 600612

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