Attic Insulation

[fordes]

Info wanted,

we are currently building a bungalow and are looking at roof insulation.
Because the roof is a hip roof and has a low pitch we don't plan to have an attic up there and we won't have a water tank or anything that could be damaged by the cold. Due to a larger area of the roof we were thinking of insulation between the ceiling joists but are not sure what insulation type to use that would be most affective.
We have put in 100mm high density under floor insulation as well as 60mm cavity insulation as well as insulated plaster board on all external walls so the only area not well insulated is the roof area.

Any suggestions would be greatly appreciated

[kkelliher]

You have two real options outside putting down fibreglass insulation.

The first is Kingspans Roof insulation 120mm thick foil backed

the other is a new product called Actis supplied by U-Value insulations (others may stock it aswell)

http://www.uvalue.ie/index.php?categoryid=10

Just be carefull in all instances with ventilation

[pete]

Batt insulation when installed in a vertical plane, slung underfloor or installed @ whatever angle on a pitched roof will
tend to slump due to gravity and leave moisture/cold air gaps between topside of the insulating batt and the contact surface. Examining batt insulation on a vertical wall gravity will cause a gap to occur at the top as also whenever you join one length of batt to another at the joint there is going to be a another gap and over time the bottom piece will slump even further. A batt insulated under floor is normally held in place by string ties, in time the batt weight causes slumpage and the strings also give - batt insulation is a thing of the past.

Spray foam insulation is the only way to go, gets in everywhere, it's clingy, stays in place regardless of installation
mounting and provides good seal / longevity protection.