Prima Joint Filler 25kg Bucket 1K

Prima Paving Joint Mortar 1K 25kg

Application Areas

For bonding in construction
For grouting of mosaics, small and large paving stones
For joints with widths from 3 mm
For watertight grouting of mosaic, small and large paving stones, as well as natural stone, concrete, clinker, outdoor ceramics, and clinker
Suitable for non-absorbent natural stone slabs
Only suitable for application on watertight substrates
For ground surfaces in private areas with foot traffic and occasional vehicle traffic, such as parking lots, garden paths, garage drives, and terraces

Product Properties

Thixotropic, also suitable for grouting concrete paving and slabs
Can be water-absorbed, enabling dense joints even with narrow gaps
1-component, ready to use immediately
Weather-resistant and durable
Resistant to weathering; material does not spall
Crack and shrink-free setting
Water-permeable, allowing rainwater to quickly drain into the substrate; surfaces are not fully sealed
Frost and weather-resistant

Substrate Preparation

The substructure must be watertight
The entire paving construction must be designed to withstand actual loads and comply with technical standards
For moderate loads, installation can be carried out in sand, gravel, or split; in the case of split, careful compaction is essential
Paving stones and slabs should be embedded approximately 1/3 in the split bed; additional stabilization with sand or crushed stone may be necessary
Generally, joint mortar cannot compensate for significant movements of paving stones and slabs
For higher loads, bonded construction with drain mortar, e.g., with drainage mortar, should be used
Ceramic slabs should be back-primed and set in a drainage mortar; joint areas must be drainage-permeable after installation
Required joint depths:

Untrafficked surfaces: at least 30 mm
Trafficked surfaces: at least 40 mm
Ceramic slabs set with drainage mortar and back-priming: at least 15 mm

In case of old paving renovation, joints should be blown out to the required depth, and dirt on the stone edges should be removed
Before grouting, the surfaces of the paving or slab layers must be thoroughly cleaned until the surface can no longer absorb water; multiple cleaning may be necessary, especially on rough surfaces or in high-temperature conditions
During processing, the surface must not dry out; intermittent moistening depending on ambient conditions is recommended

Application

For joints from 3 to 8 mm, apply Prima Paving Joint Mortar 1K onto the wet surface and work into the joints with a firm rubber trowel, pressing firmly. Fill the joint space as completely as possible.
Immediately after, actively support the filling with a water jet. For particularly narrow joints, direct the water jet precisely along the joints.
Settled joints can be immediately refilled with fresh material, ensuring the joint is completely and tightly filled to the bottom.
After applying the mortar into the joints, thoroughly remove excess mortar from the stone surface with a soft broom, e.g., a coconut broom, to prevent material from being pulled out along the joint line, clean diagonally to the joint direction.
For joints wider than 8 mm, apply Prima Paving Joint Mortar 1K onto the wet surface and work into the joints with a firm rubber trowel, ensuring complete and tight filling to the bottom.
Remove excess mortar from the stone surface with a soft broom, as described above. Unused fresh material and mortar residues cannot be refilled into the container and should be covered with water, kept moist, and used within a maximum of 4 weeks.
Apply water to the surface and work into the joints as described.