Super Insulated Flat Roof

Insulating a roof from inside is technically feasible.

Super insulated flat roof. Find yourself an architect who gets it and helps make it invisible. It s what s called the cold roof principle. Can a flat roof be insulated from inside from the ceiling of the area below. Blow insulation onto a flat ceiling.

Re roof insulation upgrade advice my late 60 s flat roof 2 story home is getting to the point of needing roof maintenance. As far as i can tell there is fiberglass insulation between the ceiling joists which i would guess are 2x8. It currently has an edpm roof with no added external insulation as far as i know. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof.

This stuff needs to be invisible or it will not happen. 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. Insulation material is placed on top of the roof rather than in between the ceiling and the decking. Polyisocyanurate insulation above the sheathing and approximately 91 4 in.

This system was often used in the past but is not recommended nowadays. Notice the increase in overhang dimension on the gable ends. Can t tell this roof is a super insulated over roof which was the whole point. Lots of traditional flat roofs are of the cold roof construction type.

This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls. However there is one tight spot that needs special attention. Ample vertical space about 22 inches is ideal exists under most roof slopes to achieve r 60 insulation. 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.

Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. This may help with condensation but causes such a loss of heat that it has been banned in scotland. Warm flat roof insulation. Thermo ply sheathing is not a new product.

With three layers of 11 2 in. Highly insulated ceiling or roof. Both these variants require different approaches to insulation which will be covered in this guide. Insulation is placed in between the joists underneath the roof surface above.

There are three methods for insulating the top side of the building envelope box. This is not just to match the overhang on the front. There is no attic. Insulating a flat roof is a task that must be done during construction.