The ground should have a layer of concrete poured across and there should be a ventilated gap of at least 150mm between the underside of the timbers and the concrete, to prevent moisture gathering and affecting the. • the minimum area of ventilation should equate to at least 1500mm2 per metre run of external wall. All properties with hollow floors should have air bricks built into the wall to allow a free flowing passage of air.
Thermal breaks are key to retaining heat within the
The floor void beneath the beams should be appropriately vented, ensuring that a cross flow of air between two external walls is achieved.
2) if you replace this you will need to bring it up to today’s building regs.
The existing floor level to the house may be quite high above ground, and in cases such as this it is more practicable to use timber joists, with a void underneath. I’m aware i need to install air bricks which the room had none. Some people have said put limestone in the hole then dpm. A minimum gap of 150mm should be kept between the existing concrete ground and the.
A suitable dpm such as 1200 gauge polythene must be installed in the floor either above or below the concrete slab, (see diagrams) if a liquid dpm is used, care should be taken that it is compatible with jabfloor, and that it is completely dry before the insulation is laid.
The minimum flooring height will be. When to use a damp proof membrane. The tops of piles must be a minimum of 150 mm above ground. If the suspended timber floor has been removed and replaced with a solid concrete floor, the void will also be filled in with concrete, so there’s nothing to ventilate.
Dampness and moisture can play havoc with wooden flooring and there’s little point in investing the time and money required to install a new floor over what may.
Where there is a risk of sulfate attack, a polyethylene sheet dpm, not less than 1200 gauge (0.3mm) (or 1000 gauge (0.25mm) if assessed in accordance with technical requirement r3 ) should be used, properly lapped. A protective coating is required to cut ends of timber. Vacuum impregnation is far more effective than after market spraying. I would also treat the new timber as a precaution and sandwich dpc between it and the brickwork if not using joist hangers.
A suspended concrete floor is a floor slab where its perimeter is, or at least two of its opposite edges are, supported on walls, beams or columns that carry its self weight and imposed loading.
The floor spans between supports and will normally deflect under load to a dimension that is limited by the design used. Supports underneath the floor are permanent and include sleeper. The ventilation as you've already identified is the 1st thing to start with in putting the problem right. Traditional ground floors have consisted of little more than a few flagstones or bricks placed directly over the soil.
Brush treat any cut ends.
Also removed all rubble and sand/dirt under the floor. Although timber ground floor construction used to be a popular method, today it is not as common as the concrete alternatives. A dpc is required for all concrete piles and for timber pile tops within 300 mm of the ground. The lowest point (3 foot down) has had water in it when it rains the last couple of weeks.
Older properties (like sections of mine) with a suspended timber floor would ensure cross ventilation via air bricks to keep things dry.
We are doing some work on suspended timber floor and have some damp issues. 1) the area could be painted with a liquid damp proof up the walls to the damp proof course and the the floor covering laid or a dpm (damp proof membrane) could be laid under the floor covering and lapped up the walls behind the skirting. If you plan to fit a new solid wood or engineered wood floor, it’s essential, before you lay the floor to find out if you need to lay a damp proof membrane (dpm). This combination persisted well into the 1930s, with solid.
Also important if there are any dwarf walls supporting say floor joists mid span, that this has a dpc somewhere to protect any timber sitting on it from getting damp.
This chapter gives guidance on meeting the technical requirements for suspended ground floors including those constructed from: A dpc is required for all concrete piles and for timber pile tops within 300 mm of the ground. If a suspended timber floor is in place, then this can be insulated as shown in our how to video ‘how to install kooltherm k103 floorboard from above joists in a suspended timber floor’. The minimum flooring height will be 150 mm (for the pile) plus bearer depth plus joist depth.
A suspended timber floor is constructed as a timber platform of boards nailed across timber joists supported on sleeper walls, and the external and internal load bearing walls surrounding them.
You may have to crush or break apart a sample. For a solid floor, specific attention should be paid to the construction of the wall, and especially considering if a damp proof course (dpc) is present, as this might not be the case in older. If the floor is just getting damp then dpm covered with gravel will be fine. The tops of piles must be a minimum of 150 mm above ground.
A suspended floor is a ground floor with a void underneath the structure.
A protective coating is required to cut ends of timber.
