2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
In modern construction, laminated plywood for formwork has been actively used. It is suitable for the construction of various types of foundations. Its service life is quite high, since the surface is protected from moisture by a special coating. The highest quality products can withstand up to 50 cycles of use without significant deformation changes.
General product information
Laminated plywood for formwork is produced from pressed wood. The individual layers are bonded together with a resin-based adhesive. Acrylic lacquer is applied to the end parts of the boards to provide moisture protection. A film of sufficient density is applied on top. Manufacturing technology involves exposure to high temperatures and a certain pressure.
Advantages of using material
Since laminated plywood for formworkhas good moisture resistance and sufficient strength characteristics, corresponding to the points of GOST, its operational period is quite long. The phenolic film on the surface protects the material from UV radiation.
Sheets are easy to cut even when working with hand tools. Studs, nails or self-tapping screws can be used as fasteners. Due to the presence of a special film, the concrete composition does not stick to the surface of the slabs.
Classification by quality characteristics
Depending on the grade, laminated plywood for formwork may have a different cost. Each category allows for certain flaws. There are four types of products in total:
- Defects are completely absent.
- There are wormholes and intergrown knots that are closed with veneer inserts.
- There are holes and hollows.
- The surface contains a large number of various vices.
The quality of boards improves with grade increase. Their strength also becomes better, which has a positive effect on the service life. Products without knots and wormholes will in any case be used longer.
Laminated plywood for formwork: sheet dimensions
When pouring foundations, 18 mm thick slabs are most often used, since their strength is quite high, and the price is quite acceptable. With regard to width and length, sheets of 300x150, 250x125 and 244x122 cm are more common.
Some manufacturers produce products of other dimensions, but they are rarely used to form formwork. All sizes shown are of the same brand and do not differ in performance or physical properties.
Bearing frame elements
Before laminated formwork plywood can be installed, a support structure must be erected that can support the concrete mix. Typically, a metal profile system may include:
- linear boards having approximately the same dimensions as sheathing sheets;
- corner elements used for installation on frame ribs;
- universal barriers for creating columns;
- telescopic poles equipped with a holder to form floors.
If necessary, wooden bars of a suitable section can be used for the device of the frame base. However, with regular work related to the construction of foundations, it is better to purchase special metal shields.
Laminated Product Turnover
Data on the use of various materials are almost always contradictory. However, it should be said that the turnover of laminated plywood formwork can reach 50 cycles, which is considered a fairly good result. This is possible if products from European manufacturers were purchased.
As for the Russian marketsimilar products, it is represented by a large number of brands. However, their quality characteristics are inferior to analogues from Europe. Typically, domestic products can withstand no more than 20 cycles of use under standard conditions.
Sometimes cheap film faced plywood is used for formwork. China is its main supplier. In most cases, such products become unusable after 5 cycles. However, with careless use, the life of the material is significantly reduced, regardless of the manufacturer.
In conclusion about the features of care
When installed, laminated plywood for formwork is exposed to building mixtures containing a certain amount of water, abrasives and active additives. If the coating is able to withstand the listed external factors, then the inside is not. The main danger lies in damage to the laminated surface, as a channel is opened to absorb moisture.
You can avoid the destruction of the protective layer with careful handling of products during installation work. After removing the sheets, timely cleaning of the surface from contamination should be carried out. Before long-term storage, it is advisable to lubricate the plates with special agents. This will improve the water repellency.
Careful installation of the material only requires workers to observe normal labor discipline. Plywood sheets should be laid on the preparedsurface without protruding nails and other parts with sharp ends. When installing fasteners, care must be taken to avoid damaging the coating.
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