When insulating concrete beam and block floors, it is important to ensure that insulation boards are cut neatly around service penetrations to minimise heat loss through bridging.

Here are some steps you can follow to insulate a suspended concrete beams and block floor:

1. Clean the area: Remove any debris, dust, and dirt from the space below the concrete beams and block floor. Make sure there are no obstructions in the way.

2. Measure the space: Measure the distance between the beams to determine the thickness of the insulation you will need.

3. Choose the insulation material: There are a variety of insulation materials you can use, such as rigid foam boards, mineral wool, or glass wool batts. Make sure the insulation you choose has a suitable thermal resistance (R-value) for your climate zone.

4. Install the insulation: Cut the insulation to size, and lay it between the beams. Make sure there are no gaps between the insulation and the beams or any other obstructions. You may need to use wire mesh or netting to hold the insulation in place.

5. Seal gaps and air leaks: Use expanding foam, caulking, or sealant to seal any gaps or air leaks around the edges of the floor, between the beams, and around any pipes or electrical wiring.

6. Finish the floor: Once the insulation is in place, you can add a finish layer such as plywood or chipboard to cover the insulation and create a flat surface for flooring.

Insulating suspended concrete beams and block floors can be a challenging job, and it's important to take safety precautions when working with insulation materials. Wear protective clothing and a dust mask, and make sure to follow the manufacturer's instructions for installation. If you're not comfortable doing the work yourself, consider hiring a professional insulation installer.