Oporné múry
Nízke oporné múry bez malty a bez čakania na vytvrdnutie
Vytvorte terasy v záhrade bez murára. Bloky PolyBrick® sa spájajú zacvaknutím na správne pripravený základ, takže nízke oporné múry stoja za niekoľko hodín a vydržia desaťročia.
Prečo PolyBrick funguje v tejto aplikácii
Oporný múr je práca, ktorú väčšina ľudí odkladá. Murárska práca znamená maltu, miešanie, vytvrdnutie a nutnosť urobiť všetko správne na prvýkrát. Drevené trámy hniją zo zadnej strany, kde ich nevidíte. Gabióny vyžadujú skúsené oko, aby pôsobili zámerne a nie priemyselne.
PolyBrick väčšinu týchto problémov obchádza. Bloky sa spájajú zacvaknutím, takže nie je potrebná malta, miešanie ani vytvrdnutie: múr je hotový, keď prestanete stavať, nie o tri dni neskôr. Nič nehnijú, nehrdzavie, nezmenšuje sa ani sa nekrúti, takže zadná plocha je v pätnástom roku rovnako spoľahlivá ako predná.
Čo však stále vyžaduje, je správne pripravený základ. Oporný múr akéhokoľvek druhu sústreďuje zaťaženie do úzkeho pásu zeminy, preto výkop, zhutnená vrstva a výšková úroveň prvého radu nesú všetko nad nimi. Aký má byť základ, závisí od výšky múru, od podložia a od toho, čo múr zadržiava – stanovte to pre váš konkrétny projekt pred začatím prác.
Kde sa toto riešenie osvedčuje
- Záhradné terasy a výškové rozdiely terénu
- Vyvýšené záhony a ohraničenie záhonov
- Ohraničenie príjazdových ciest a chodníkov
- Schody a plošiny na svažitom teréne
- Nízke oplotenia a clonové múry
- Múry pre kvetináče a sedenie
- Ohradenie pre nádoby na odpad a sklad dreva
- Terasy na záhradkárskych a komunitných záhradách
Prehľad parametrov
| Montáž | Zacvakávacie spájanie. Bez malty, bez cementu, bez špeciálneho náradia |
| Vystuženie | [Potvrdiť: priemer prúta, trieda, rozostupy, kotvenie, maximálna výška, podmienky podložia] |
| Základ | Výkop na únosné podložie, zhutnenie a vyrovnanie do vodorovnej roviny. Navrhnúť pre konkrétnu stavbu |
| Odvodnenie | Voľne priepustná zásypová vrstva je nevyhnutná. Tlak vody je hlavnou príčinou porúch oporných múrov |
| Materiál | 100% recyklovaný polypropylén, stabilizovaný voči UV žiareniu, vyrobený v EÚ z recyklovaných polymérov |
| Údržba | Žiadna. Bez hnitia, hrdzavenia, premurovávanie škár ani ošetrovania |
| Tlakové zaťaženie | Testované na 150 ton/m² pri statickom zaťažení |
| Životnosť | 25 rokov so zárukou |
Poznajte obmedzenia skôr, ako začnete
Je dôležité byť v tomto ohľade úprimný, pretože oporné múry sú tou záhradnou konštrukciou, kde chyba má dôsledky presahujúce estetiku.
Oporný múr zadržiava zeminu a zemina je ťažká, najmä keď je nasýtená vodou. Čím je múr vyšší, tým väčšie sily pôsobia, pričom závislosť nie je lineárna: múr dvojnásobnej výšky nesie podstatne viac ako dvojnásobok zaťaženia.
Pre nízke záhradné terasy, vyvýšené záhony a ohraničenie hrán je správne vybudovaný múr z PolyBrick na zhutnenej základovej vrstve plne v rámci svojich možností. Pre vyššie konštrukcie, múry zadržiavajúce príjazdovú cestu alebo stavbu, múry na strmom alebo nestabilnom svahu, alebo kdekoľvek, kde by porucha mohla ohroziť suseda, budovu alebo komunikáciu, si vyžiadajte statický posudok a nechajte múr navrhnúť odborníkom. To platí pre akýkoľvek materiál, nielen pre tento.
Ak si nie ste istí, na ktorú stranu tejto hranice váš projekt patrí, oznámte nám výšku, sklon a čo sa nachádza nad a pod múrom – a dostanete od nás úprimnú odpoveď, nie len snahu predať.
Odvodnenie je to, čo múr udrží v stoji
Väčšina porúch oporných múrov je spôsobená vodou. Zemina za múrom zadržiava dažďovú vodu, táto voda má hmotnosť a nemá kam odtekať, tlak narastá, až kým sa niečo nepohne.
Zabudujte voľné odvodnenie od samého začiatku. Zásyp priamo za múrom vykonajte čistým hranolovým kamenivom namiesto vykopanej zeminy, aby voda odtekala dolu cez kamenivo namiesto toho, aby zaťažovala zadnú plochu múru. Tam, kde je múr vyšší ako niekoľko radov, uložte perforovanú rúru pri päte tejto drénovanej vrstvy a odveďte vodu na vhodné miesto.
Výhodou PolyBrick je, že voda mu nevadí. Nič nehnijú, nehrdzavie ani sa neodlupuje a škáry nie sú z malty, ktorú by voda mohla vyplavovať. Zabezpečte správne odvodnenie a múr bude skutočne bezúdržbový.
How it goes up
- Set out the line of the wall and check what is behind it. On a slope, work out where water currently runs, because the wall will interrupt it.
- Excavate a level trench along the line, wider than the wall itself, and dig out any soft or made ground until you reach firm subsoil.
- Lay a woven geotextile in the trench, then fill with compacted granular material and screed it dead level. This base carries the whole wall, and a wall built on an uneven base will show it in every course above.
- Lay the first course and check it with a spirit level along its length and across its width. Everything above follows this course, so take the time.
- Build up in courses, pushing blocks together and staggering the joints between courses so no vertical joint runs through the wall.
- Backfill behind the wall with clean angular stone as you go, not soil, and add drainage at the base of that stone on anything more than a low wall.
- Finish the top course with caps, and bring topsoil up behind to the level you want.
Full detail is in our project guidance, and we are happy to advise on a specific build before you order.
Getting the base right
This is the part that decides whether the wall is still straight in ten years, and it is the part most likely to be rushed.
A retaining wall concentrates a lot of load into a narrow strip of ground. If that ground is soft in places, made ground, or has never been compacted, the wall settles unevenly, courses open up and the line goes.
Dig out to firm subsoil, put a proper compacted granular base in, and screed it level rather than raking it. Check level along the run and across the width. It is an hour of work that determines everything above it, and it is the only part you cannot go back and fix.
Terracing a slope
Two low walls usually beat one tall one.
Where a garden falls away, stepping the level change into two or three shorter terraces reduces the load on each wall considerably, gives you usable planting space between them, and looks better than a single high face. It is also far more forgiving to build.
Set each terrace back from the one below rather than stacking them vertically, and drain each one separately. Water that runs off the top terrace should not arrive behind the bottom one.
Finishing and planting
A PolyBrick wall reads as a deliberate structure rather than a landscaping compromise, and it takes finishing well.
Cap the top course for a clean line. Plant trailing species along the top to soften the face over a season, or run planting in front of the wall so the structure becomes the backdrop rather than the feature.
Where a wall doubles as seating, keep the height comfortable and cap it properly. Where it forms a raised bed, line the soil face if you want to keep the fill separate, though the material itself is inert and will not leach into the soil.
Get it right first time
The one thing worth knowing: drain behind the wall, not just in front of it.
Almost every retaining wall that fails, in any material, fails because of water pressure behind it rather than the weight of soil alone. Saturated ground is dramatically heavier than dry ground, and it pushes.
Backfill with clean angular stone rather than the soil you dug out, run a drain at the base of it, and give that drain somewhere to discharge. It costs a bulk bag of stone and an afternoon. It is the difference between a wall that is still straight in twenty years and one that starts leaning after the first bad winter.
Ask our engineer
Questions about wall height, reinforcement, drainage or whether your project needs designing? Ask below, or get in touch directly.
Common Questions
How high can a PolyBrick retaining wall be built?
For low garden terracing, raised beds and edge retention, a properly built wall on a compacted base is well within its comfort zone. Beyond that the answer depends on the slope, the soil, the drainage and what sits above and below the wall.
For anything taller, anything retaining a driveway or structure, or anything where failure would affect a neighbour, a building or a highway, take engineering advice and have the wall designed. Tell us your height and site and we will give you an honest answer.
What foundation does a PolyBrick retaining wall need?
A trench excavated to firm subsoil, filled with compacted material and screeded dead level. What that foundation should consist of depends on the height of the wall, the ground beneath it and what it is retaining, so establish it for your site rather than assuming.
Whatever you build, that base carries the whole wall: screed it rather than raking it and check level along the run and across the width. It is the only part of the build you cannot go back and fix.
What should I backfill behind a retaining wall with?
Clean angular stone, not the soil you dug out. Most retaining wall failures in any material are water failures: saturated soil is dramatically heavier than dry soil and it pushes.
Free-draining backfill lets water travel down through the stone instead of loading the back face, and on anything more than a low wall a perforated pipe at the base of that stone should take it away.
Do PolyBrick walls need maintenance?
No. There is nothing to rot, rust, spall or repoint, and no mortar joints for water to wash out. The material is UV stabilised recycled polypropylene, so it does not need treating, painting or sealing.
Get the base and the drainage right at the start and the wall is genuinely maintenance free.
How does it compare to sleepers or concrete blocks?
Sleepers rot from the back where you cannot see it, and need replacing. Concrete blocks mean mortar, mixing and curing, and a wall that is finished three days after you stop working.
PolyBrick pushes together dry, so the wall is finished when you stop building, and nothing degrades from the buried side.
Is it better to build one tall wall or two shorter ones?
Two shorter ones, usually. Stepping a level change into two or three terraces reduces the load on each wall considerably, gives usable planting space between them, looks better than a single high face and is far more forgiving to build.
Set each terrace back from the one below and drain each one separately.
Will the plastic leach into my soil?
No. The material is inert recycled polypropylene and will not leach into soil, which is why the same blocks are used for raised beds and planters growing food. It locks the waste plastic up rather than releasing it.
Do I need planning permission for a garden retaining wall?
Low garden walls are usually permitted development, but height limits apply and they are lower where a wall adjoins a highway.
Rules differ across the UK and are tighter for listed properties and conservation areas. Check with your local planning authority if your wall is anything other than low and clearly within the garden.
