Construction method of polyurethane rigid foam waterproof and thermal insulation integrated board

Construction method of polyurethane rigid foam waterproof and thermal insulation integrated board

1. Construction preparation

Material preparation

Core material: polyurethane rigid foam waterproof insulation board (needs to comply with national standards, apparent density ≥55kg/m³, thermal conductivity ≤0.024W/(m·K), closed cell rate ≥95%).

Auxiliary materials: bonding mortar, mechanical fixings (such as anchor bolts), alkali-resistant fiberglass mesh, plastering glue, sealant, tape, etc.

Tools and equipment: foaming machine (two-component), mixing head, conveying pipe, cutting machine, electric drill, level, scraper, pressure roller, measuring ruler, etc.

Grassroots processing

Base layer requirements: solid, flat, dry, without cracks, moisture content ≤8%, flatness error ≤5mm/2m.

Repair treatment: Repair defects such as unevenness, cracks, honeycomb pitting, etc., and make the yin and yang angles into arc transitions with a radius of ≥50mm.

Cleaning treatment: Remove floating dust, oil stains, and debris on the surface of the base layer to ensure the quality of the interface agent.

Environmental conditions

Temperature: The construction environment temperature should be above 15°C. Heating measures (such as covering with insulation quilts) are required when the temperature is low.

Humidity: relative air humidity ≤85%, avoid construction in rainy days, snowy days or strong winds (wind force > level 3 requires shielding).

Weather: Before construction, confirm that there has been no rainfall in the near future. After rain, work must be resumed after the base layer is dry.

2. Construction process

Elastic thread and hanging thread

According to the design requirements, the dividing lines, door and window opening control lines, and floor horizontal lines are popped up, and vertical reference lines are hung at the large corners of the exterior walls to ensure the verticality of the board pasting.

Preparing bonding mortar

Prepare the bonding mortar according to the proportions in the product instructions, stir evenly and let it sit for 5 minutes. Stir again before use to avoid clumping.

Paste polyurethane rigid foam board

Pasting method: Use the strip pasting method or dot frame method to evenly apply the bonding mortar on the back of the board with a thickness of 3-6mm and an effective bonding area of ​​≥40%.

Pasting sequence: Paste from bottom to top and from left to right in staggered seams. The seams of the panels should be staggered by ≥200mm to avoid through seams.

Flatness control: Use a level ruler to check after pasting, and adjust the flatness and verticality in time. The gap between the panels should be ≤5mm.

Mechanical fixture installation

Install the fixings 24 hours after pasting. The number is determined according to the design requirements (generally 4-6 per square meter). The fixing depth is ≥25mm to ensure that the board is firmly connected to the base layer.

Special parts treatment

Door and window openings: add a 300mm wide additional layer, and thicken the gutter area to 1.5 times the design thickness.

Pipe root: wrap the pipe height ≥ 250mm, and fill the gaps with sealant.

Deformation joint: filled with plastic rods, sealed with sealing paste, and then covered with alkali-resistant fiberglass mesh for reinforcement.

Board seam treatment

Caulking: Fill the board joints with one-component polyurethane foam caulking agent and press into the backing material (the diameter or width is 1.3 times the joint width).

Sealing: Use silicone construction sealant to seal. The sealant is full, dense, and bubble-free, and the width and thickness meet the design requirements.

Protective layer construction

Flat surface: Apply a 20mm thick cement mortar protective layer, or lay fine stone concrete.

Facade: Apply interface agent on the hard foam body, stick alkali-resistant fiberglass mesh cloth, and then apply 20mm thick anti-crack plastering glue.

Decorative surface construction

Select paint, ceramic tiles, stone and other decorative materials according to design requirements, and construct according to specifications to ensure smoothness and beauty.

3. Key points of quality control

Material inspection

Materials entering the site must have factory certificates and inspection reports, and key indicators such as compressive strength and dimensional stability must be rechecked on site.

Construction process inspection

Thickness control: Use the steel needle insertion method to detect the thickness of the insulation layer, with a deviation of ±3mm.

Flatness: Check with a 2m ruler, the error is ≤5mm.

Bonding strength: The pull-out test detects the bonding strength between the bonding mortar and the base layer, ≥0.1MPa.

Finished product acceptance

Water storage test: Roofing projects need to conduct a 24-hour water storage test to check for leaks.

Infrared thermal imaging detection: Check the overall tightness to ensure there is no thermal bridge.

Seam spray detection: Spray the seam area with a 0.75MPa pressure water gun to check the sealing.

4. Precautions

Security protection

Construction workers need to wear gas masks and protective gloves, set warning signs in the work area, and maintain good ventilation.

Material residues should be collected and handed over to professional agencies for disposal. On-site burning is strictly prohibited.

Finished product protection

It is strictly prohibited to trample within 72 hours after construction, and avoid heavy impact within 15 days.

Before the construction of the protective layer, a non-woven isolation layer is laid, and wooden planks are used to pave the passage when transporting materials.

seasonal construction

Windproof and thermal insulation measures need to be taken during construction in winter. Work will be suspended when the ambient temperature is below 5°C, and the constructed parts will be covered and maintained with flame-retardant insulation blankets.