You do not need any air space between the insulation and your flooring because your floor will let air and water vapor through it (unless it is plastic, which you should not do because it would be a vapor barrier).
Should there be a gap between loft boards and insulation?
Position the crawling boards in the furthest corner of the loft. You’ll need to start laying with a minimum gap of 25mm between the eaves and the insulation to ensure a suitable air gap. Maintain this gap along two opposite sides of the loft.
Do I need to leave an air gap for insulation?
Insulation is technically a solid with a lot of air in it therefore, it is NOT an air gap. You literally must have a VOID, nothing in the air gap except air itself. So if you are installing under a roof or in a wall, you must create an air gap.
Can you put loft insulation on top of boards?
Yes you can most certainly overlay and additional layer of insulation over the chipboard. I would leave the insulation short at the eaves though to ensure there is adequate ventilation in the loft space. This would most certainly improve you homes thermal performance during winter months.
Do you need an air gap with Kingspan?
The timbers must be deep enough to allow the desired thickness of Kingspan Kooltherm K112 Framing Board to be fitted between them along with a 25 mm (min.) air gap between the insulation layer and the brick wall.
Can I cover my attic insulation with plywood?
Once the insulation is down, you can turn your attic into valuable storage space by covering the floor with plywood. It will also make the attic a safer place in which to walk.
How much gap do you leave with insulation?
It is important that air is allowed to circulate between the roof covering and the insulation to avoid condensation – a gap of at least 50mm (2 inch) must be left between the insulation and the inside of the roof covering.
Does foil backed insulation need an air gap?
Do you need a 25mm air gap under the membrane? Although this is often considered standard practice, it is not a requirement; the important thing is that the drape in the breather membrane (which allows any water getting through the tiles to channel down to the gutter) should not be pushed out.
What are the Building Regulations for loft insulation?
Since 2003, current building regulations recommend a depth of at least 270mm (mineral or glass wool) in the loft – use this as a starting point rather than a finishing line to see larger savings. In 1995, the recommended depth was 200mm. Prior to that it was less than 100mm.
Does an air gap provide R value?
Based on the difference between test #1 and #6, the R-value of a non-reflective air-space and vinyl siding provides an R-value of about R-0.64.
Does kingspan need a Vapour barrier?
Composite products. Composite products (such as Kingspan K118 Insulated Plasterboard) include integral moisture vapour control. As with any vapour control, workmanship is crucial. For example, taping and lapping joints for polythene, avoiding penetrations, and then sealing around any penetrations.
Should I insulate between the rafters in my attic?
Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. Just don’t put it in the eaves. Also, make sure the attic is well ventilated.
Should you insulate the underside of your roof?
In order to avoid damage to the roof deck, you should insulate ceilings to create an air barrier between the living space and an unfinished attic or airspace underneath the roof deck.
Can I put boards over attic insulation?
An attic can be floored with 1/2″ CDX plywood, if it is being used only for storage. However, the same can’t be said if you are planning on using the space as a living space. In that case, you will need to use 3/4″ thick plywood. As an alternative, 3/4” OSB can be used.
Can I put insulation over attic floor?
A. Without removing the flooring, you have the option of blowing loose-fill insulation (fiberglass or cellulose fiber) over the top of the floor. This, of course, would preclude using the area for storage. But if that isn’t a problem, then covering the floor with insulation would be one relatively easy solution.
Can you walk on insulation in attic?
Quote from the video:
Quote from Youtube video: You could step on that and if you do that you're you could fall all the way through or you could just crack the sheetrock.
Can attic floor support weight?
If you’re talking about the floor of an attic, then it may, or may not, support the weight of a person. We’ll tell you how you can figure it out. If you’re talking about walking on the roof and therefore relying on the roof truss and attic to support you, it highly likely that the roof will support you.
How thick should plywood be for an attic floor?
Joist Spacing and Attic Use
You need 3/4-inch plywood. The thinner plywood is acceptable when the joist spacing is 16 inches. If you plan to finish the floor in the attic and turn the room into a living space, however, you should always use 3/4-inch plywood.
How often should you check your attic?
once every 3 to 6 months
Checking Your Attic
As a general rule, it’s a good idea to check your attic once every 3 to 6 months. There are numerous reasons why checking your attic regularly is important, notably it’s the first place leaks will show themselves. If a leak occurs, there will be signs of it in your attic before anywhere else.
Should I see daylight in my attic?
But it should be slits of light at most, not a strong light. On a bright sunny day go into your attic with the light out and see what daylight you can see. At most there should be a glow of light at the eaves (end of rafters by floor) you should not be able to see your neighbor.
How an attic should look?
Quote from the video:
Quote from Youtube video: You'll want to make sure that it's nice and coverage. There is some cases where you have low spots or more clumps that's due to wind washing.
