Natural Stone Kerbstone | Kavala Slate Kerbstones | Pavement Kerbstones
Discover the splendid Kavala Slate Kerbstone, with 8-10 cm thickness, 20 cm width and splitface finish. It is durable and useful. Available size: min. 35 cm length, 8-10 cm thickness, 20 cm width x FL (free lengths, min. 35 cm). This product was developed for landscaping projects which include roadways, but can also be used to define the backyards walkways. Besides, the grey color makes it easy to integrate into any decoration project. Kavala Grey Slate with splitface finish (split surface & sides) is one of the most durable kerbstones from our product range.
Usage: pavements, cobblestone, polygonal stone or any flooring with the splendid Kavala Slate
Areas of use:
- define walkways and streets/roads
- outline areas from small squares, car parks, gardens and public parks
- full pavement for roads and streets
- outline for public and residential areas
Slate is a metamorphic rock derived from sedimentary rocks subjected to high temperatures and pressures. Slate belongs to foliated rocks (repetitive layering in metamorphic rocks) and thus is explained the natural tendency to be split in thin sheets, for producing flexible slate:
Slate features:
- density: 2 700 kg/m³
- hardness (Mohs scale): 6
- water absorption (normal conditions): 0.3 %
- mechanical strength (compression): 39 MPa
- mechanical strength (bending): 86.25 MPa
- abrasion resistance: high
- fire rating: class A1 (non-flammable)
Available size: Kavala Slate Kerbstones can have custom-size (W x L x H): 8-10 x 20 cm x FL (min. 35 cm). Discover Kavala Slate product range, with pavements and kerbstones for durable streets, easy to maintain.
Lay out Natural Stone Kerbstone | How to lay out Pavement Kerbstones
Everything you need to know about natural stone lay out. Stone kerbstones are laid out on a concrete bed (semi dry screed) with gravel support or on gravel bed, without concrete.
If you want to lay them out by yourself, just follow the next steps:
Kerbstones laid out on concrete bed (semi dry screed):
1. preliminary preparation: carefully inspect the areas before digging, to avoid damaging the utility routes
2. surface cleaning: remove any debris of plant, stones or tree trunks
3. soil excavation: dig a trench of about 25 cm deep
4. laying out the gravel: lay out approx. 10 cm of gravel (crushed stone), then compact it by hand or use a vibratory plate compactor
5. cast-in-place concrete: a layer of approx. 10 cm
6. laying the kerbstone: on fresh concrete up to a depth of 5 cm. Then, adjust it to line and level with fresh concrete.
Lay out kerbstones on a gravel bed – recommended for max. 20 cm height kerbstones, garden alleys and separation of green areas, etc. This is not recommended for heavy traffic areas.
1. repeat previous steps, from 1 to 3
4. use color flags and strings to flag and mark the areas. You can use 2 strings for flagging the trench edges (preferably for curved surfaces) or a single string and dig next to it. The string must have the same height as the kerbstone.
5. trench digging: the trench depth is determined by adding the kerbstone height to the length above ground level, plus the gravel thickness that is laid out in the trench.
E. g.: for 20 cm height Kavala Slate Kerbstone we have: 20 cm + 8 cm (the kerbstone height above the ground level) + 5 cm = 33 cm trench depth. The width should be approx. 30 cm (kerbstone width = 25 cm), to allow compaction by hand. The ditch is shoveled/excavated with perfectly straight walls and perfectly flat bottom.
6. fill out the trench with gravel/sand, then compact it
7. lay the kerbstone, then adjust its height with a rubber mallet
8. fill out the empty space around the kerbstone with excavated soil, then compact it
9. fill out the joints with soil, sand or mortar
Preliminary calculations:
How to calculate the necessary kerbstone for a backyard alley with given size
For determining the figure, divide the needed length by the kerbstone length
E. g.: for defining a 15 m (1 500 cm) long driveway, you will need 1500:50 = 30 Kavala Slate Kerbstone, 8-10 x 20 cm x FL size.
How to calculate the necessary gravel to be laid out in the ditch:
Calculate the necessary volume with the following formula V = L x l x h, in which:
L = trench length (15 m, in our example)
l = trench width – for estimation, take into account the size of a manual compactor (approximately 20 cm), but we will set aside 25 cm because you should be able to access the trench with the compactor
h = the height of the gravel layer for this kerbstone, according to step 4 from the installation procedure (10 cm)
For our example we have the following dimensions, expressed in meters (m):
V = 15 x 0.25 x 0.1 = 0.375 m³
the necessary gravel is calculated with the standard density formula (e. g. gravel of 7-16 mm, with ρ = 1550 kg/m³)
ρ = m/V => m = ρ x V, and in terms of figures
m = 1550 x 0.375 = 581 kg gravel, grain size of 7-16 mm
