Ungru Wall Stone

Ungru Wall Stone - UMK

Ungru wall stone — UMK, i.e., a natural broken limestone


1.1.Made of weatherproof Ungru limestone, which is broken mechanically (without blasting) from limestone quarries in Ridala rural municipality, Lääne County.

1.2.Ungru limestone is a mixture of grey and yellow tones — occasionally the stones may also be in brownish-yellow, yellowish-brown, bluish-grey and other tones. The stones are with a layered structure.

Description of the product, dimensions and tolerances:

2.1.All surfaces and edges of U-wall stone are either natural or broken.

2.2.The colour is mainly yellowish-brown up to brownish-yellow, but there may be occasional bluish-grey tones.

2.3.The selection of colour is not performed.

2.4.Standard dimensions: row heights (thickness) 8–12 cm, 12–20 cm and 20–30 cm. The edge lengths of the stones are between 15–50 cm (mainly 20–40 cm).

2.5.Broken stones with unsorted thicknesses (6–30 cm) are also available for order.

2.6.The height differences within one stone may vary up to 3 cm.

2.7.In the extent of 90%, the thickness of the delivered material must remain in the predetermined thickness range; the thickness may be different in the edges of some stones.


UMK 6/10 (U-wall stone with 6–10 mm thickness)

2.9.The stones may not have consistent cracks (NB! Not to be mistaken for the grooves of mineral calcite!).

2.10. After installation there may be some colour changes on the stones (brownish lines around the stone), which will later disappear.

2.11. There may be a thin layer of clay residue on some stones, which can be easily removed.

2.12. U-wall stone is sold by cubic metre. The amount of the material in pack (pallet) may differ from that shown on the delivery note up to 5%.

2.13. The pallet usually holds 1 m3 of material. The pallet weighs about 2 tons.

Information that must be indicated in an order:


3.2.Place of use — either indoors or outside, for building masonry or for other purposes.

3.3.We recommend obtaining 10–15% more material so as to compensate for the installation losses.

Possible places of usage:

4.1.For building fences and walls

4.2.In garden design, for establishing rock gardens, etc.

Installation tips:

5.1.We recommend ordering installation works from Ungru Paekivi OÜ, who will give a 2-year warranty to both the material and the installation.

5.2.When performing installation works yourself, we advise using lime mortar, which is made of clean (washed) sand and clean water. We do not recommend using Portland cement, which may cause the stones to change their colour.

5.3.Attention should be paid to make a proper hydroinsulation for walls.

Ungru Wall Stone Gallery