Super Insulated Flat Roof

There are three methods for insulating the top side of the building envelope box.

Super insulated flat roof. Insulation is placed in between the joists underneath the roof surface above. Find yourself an architect who gets it and helps make it invisible. Notice the increase in overhang dimension on the gable ends. Insulating a roof from inside is technically feasible.

Warm flat roof insulation. This is not just to match the overhang on the front. Retrofitting flat roof insulation is a difficult task and often a messy one that involves pulling up the waterproof layer that finishes off the deck so as to put flat roof insulation in underneath. This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls.

Both these variants require different approaches to insulation which will be covered in this guide. As far as i can tell there is fiberglass insulation between the ceiling joists which i would guess are 2x8. Blow insulation onto a flat ceiling. Lots of traditional flat roofs are of the cold roof construction type.

It s what s called the cold roof principle. Insulation material is placed on top of the roof rather than in between the ceiling and the decking. It s been around for years. Thermo ply sheathing is not a new product.

It currently has an edpm roof with no added external insulation as far as i know. This may help with condensation but causes such a loss of heat that it has been banned in scotland. This stuff needs to be invisible or it will not happen. There is no attic.

Can t tell this roof is a super insulated over roof which was the whole point. When installing a flat roof it is important to ensure you have suitable flat roof insulation to minimise any heat loss and improve noise insulation and is an essential part of the roof structure without appropriate flat roof insulation the extension or building will not pass building regulations. Polyisocyanurate insulation above the sheathing and approximately 91 4 in. Can a flat roof be insulated from inside from the ceiling of the area below.

Highly insulated ceiling or roof. Your plan violates the 2006 irc section r806 4 which requires the use of air impermeable insulation when the insulation is applied directly to the underside of the roof sheathing. Cold flat roof insulation. Re roof insulation upgrade advice my late 60 s flat roof 2 story home is getting to the point of needing roof maintenance.

Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. With three layers of 11 2 in. This system was often used in the past but is not recommended nowadays. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof.