Building a round arch from Ytong - that's the way
Ytong is a lightweight cellular concrete made of quartz sand, lime, cement and aluminum powder. A round arch is easy to build.
Ytong is much lighter than traditional bricks. For this reason, home improvement Ytong construction is often a popular alternative to traditional walls.
Caution: Under no circumstances should the do-it-yourselfer craft self-supporting Ytong walls. The danger of collapse is too great. On its own, however, it is feasible to raise a non-load-bearing Ytong wall. Equally feasible is the independent production of decorative elements, such as round arches.
1. Planning for the Ytong Building
The DIY enthusiast has three options: he can, for example, raise a wall and cut the bow with the saw. For the cut-out, use conventional door dimensions according to DIN and plan the rounding to 180 degrees in the upper third.
Alternatively, ready-made Ytong elements can be purchased in runway form and used at the desired location. For example about a furnace niche. Who wants to build a round arch made of cellular concrete, constructed the element on a wooden formwork. In the planning sketch, the do-it-yourselfer also uses the standardized door width as the distance between the two ends of the arch.
Since Ytong is relatively inexpensive, plan stones are available from as little as 20 euros per square meter. The home improvement should not underestimate the workload. He is busy for two to three weeks with dry periods.
2. Production of the formwork
From scratching wood, the do-it-yourselfer saws a substructure in the required dimensions for its own construction of the arched element. The formwork carries the exact dimensions of the planned round arch section in the wall. The Ytong round arch element later serves as a surround for the semicircular cutout in the wall.
Attention: Leave a support board for the first stones of the arch on both sides of the woodchip in the thickness of the stones.
3. Wall arching on the formwork
To wall the round arch made of ytong stones onto the formwork, start from the outside. The herdsman joins the Heimweker by means of a trowel through aerated concrete adhesive and mortar. Joints amount to about 0.5 centimeters on the mortar bed of the formwork and make out about two centimeters to the outside. Put stone on stone and spread the mortar on the set stone for the next one. Always use the middle one as the last stone.
4. Installation of the round arch element
The round arch element must dry completely. Beware of temperatures below five and above 20 degrees. The fabric then can not harden evenly. How long the drying time is depends on the manufacturer. Read the technical data sheet - the span can be between days and weeks.
Coat the finished round arch piece to the intended wall area and secure it with a metal spreader. After about two weeks, the construction hardens and the column can be removed.
5. Plastering and Decorating
Caution: Ytong absorbs moisture as a lightweight concrete, which considerably increases the risk of mold. Therefore Ytongelemente always plaster over the entire area, especially in the outdoor area. That means plaster also comes on the inside of the bow. Since the round arch construction is often connected with a change of material from Ytong to conventional masonry in the manner described, plaster inlays.
In the interior, lime or cement plasters are used for the first time after a coat of primer. Outdoor weather-resistant plasters. In the second cleaning session, finish with a coat of silicate plaster. Alternatively, ceramic tiles can be laid directly on the aerated concrete indoors. This works with tile adhesive and provides a more typical round-arch look.
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