Permanent formwork with PENOPLEX®: double protection, triple benefit

High-quality thermal insulation PENOPLEKS^® from extruded polystyrene foam at the stage of construction of a shallow strip foundation can be formwork, during operation of the building - a heater. This solution is called "Fixed formwork with PENOPLEX^®". It brings double protection and triple benefits: material costs are reduced, the number of technological stages is reduced, labor costs are reduced.

If we consider the issue of benefits in a little more detail, then we do without purchasing wood for the manufacture of traditional removable formwork, we combine the technological stages of formwork installation and thermal insulation work, and also do not waste energy on stripping.

To implement this solution, in addition to PENOPLEX boards^® you will need the following consumables:

• a universal tie with reinforcement clamps and extensions to create the required foundation thickness and ensure the rigidity of its structure;
• reinforcing bars;
• knitting wire for fixing reinforcement;
• poppet screw screws made of polymers for mechanical fixation of thermal insulation boards to each other and fixing of corner elements;
• foam adhesive PENOPLEX^® FASTFIX^® for adhesive fixing of thermal insulation boards to each other;
• concrete mix for the foundation;
• construction tool.

MZF with fixed formwork from PENOPLEX^® is being built in 6 stages, some of them, in turn, are divided into several technological stages. Let's consider them briefly.

The territory should be free of foreign objects, debris, surface water, marked out for the construction of the foundation, drainage system and blind area. It is necessary to equip the paths for the entrance and movement of construction equipment inside the site. The tracks, as well as the storage sites, must be marked, the working tools and devices must be prepared, the issues of resource supply of the site must be resolved.

In other words, the preparation of the foundation on which the foundation will stand. This is digging a pit, and removing soil, and arranging a sand cushion, and the obligatory laying of a separating layer of geotextiles, so that over time there is no mixing of the soil-base and sand.

This is a multi-stage stage. Before its implementation, it is necessary to mark the PENOPLEX slabs^® for installing a universal screed. The stages of the stage are as follows:

3.1. Installing the retainer under the armature in the "up" position.

3.2. Preparing the holes and placing the universal tie in them.

3.3. Fastening the screed to the heat-insulating plate with a special lock.

3.4. Fastening ties.

3.5. Assembly of vertical corner formwork elements.

3.6. Arrangement of the lower horizontal formwork layer from PENOPLEX boards^®cut to size depending on the thickness of the foundation.

3.7. Connection of vertical and horizontal formwork elements. It is carried out using a universal screed, as well as mechanical fixation and PENOPLEX foam glue^® FASTFIX^®, which should also glue the seams between the slabs, if the formwork is single-layer - this will avoid concrete leakage during the hardening process. To do this, you also need to fasten the adjacent slabs with nail plates.

3.8. Placement of the permanent formwork in the design position.

3.9. Fixing the lower edge of the formwork horizontally with a bar or profile.

3.10. Backfilling of the excavation for additional anchoring of the formwork.

It is carried out in horizontal and vertical planes, the reinforcement can be connected with knitting wire or clamps.

The concrete structure will not be altered. Therefore, before pouring it is important to check the correctness of the dimensions, the quality of the reinforcement, the position of the engineering communications inputs. It is also necessary to clear the space for pouring concrete from debris and to protect the pipe entries from the ingress of concrete with polyethylene or plugs.

In more detail, the concreting process, as well as the rest of the construction of a foundation with fixed formwork from PENOPLEX^® set out in the "Technological map for the device of strip monolithic foundations using the technology of fixed formwork using PENOPLEX slabs^® and universal polymer screeds ”. It should be borne in mind that it is important to ensure not only a high quality of pouring, but also the required hardening regime so that the concrete gains its design strength.