High-R20 Concrete Foundation Construction Diagram – Building Science

This construction strategy has an installed insulation R-value of R-20.

Source: www.buildingscience.com        >” […]


  • Dampproofing
  • 2″ XPS rigid insulation
  • Concrete foundation wall
  • 2″ XPS rigid insulation
  • 2″ XPS rigid sub-slab insulation
  • Gypsum board with vapor retarder paint
  • 2″ XPS rigid insulation under slab

Thermal Control:  This construction strategy has an installed insulation R-value of R-20 and has a predicted annual heating energy loss of 16.7 MBtus.

Moisture Control:  Two inches of XPS on the interior, connected to the thermal break at the slab edge, controls the interior vapor drive and capillary wicking to the interior so there are no moisture related issues from inward vapor diffusion or capillary wicking.

Constructability and Cost:  The interior of the insulated concrete form will require drywall or other thermal barrier to achieve the fire rating required by code. The gypsum board is very easy to attach to the plastic clips designed into the ICF. The drywall should not be painted, if it is not necessary, to allow maximum drying of the concrete. It may be easier and more practical to install a thin framed wall (e.g. 2×3 wood or steel framing) on the interior of the ICF to allow any necessary services to be run in the wall, and potentially more insulation.

Other Considerations:  Because the concrete is installed between two vapor retarding layers, it will take several years for the concrete to dry to equilibrium. Since additional interior vapor control should be avoided, no more than latex paint should be used on the interior surface of the drywall. […]”<


See on Scoop.itGreen Building Design – Architecture & Engineering

Construction Materials Scarcities in India spurs alleged Mafia-Political corruption

See on Scoop.itGreen Building Design – Architecture & Engineering

In several areas, Indian rules and regulations make honest business impossible. The only choice is illegal business or no business.

Duane Tilden‘s insight:

>Sand is essential for construction. Sand, gravel and cement are mixed to produce concrete. But an acute sand shortage has been created by licensing and environmental bottlenecks. So, mafia groups are mining river beds illegally across India. It’s easy: one mechanical excavator can extract several truckloads of sand every night.

Sand helps retain monsoon water in river beds, releasing the water gradually in the dry season. Excessive mining endangers this. Central and state governments have detailed environmental rules for extraction, made even tougher by court interventions. Ideally, we should have environmentally safe mining that meets rising construction demand.

Instead we have grossly insufficient legal mining, huge illegal mining, sand scarcity for construction, and big illegal profits split between the mafia and politicians.

A former cabinet minister recently declared that political parties are now funded mainly by the mafia, not by big business. This again is part of the untold Durga Sakthi story.

Politicians used to demand bribes for mining licences. Now, they deliberately hold back leases to make sand scarcer, and more profitable. […]<

See on www.cato.org

China opens city-sized shopping mall, with fake sun

See on Scoop.itGreen & Sustainable News

If you don’t care about authenticity, the New Century Global Center has everything you could want, including an artificial Mediterranean village. Read this article by Tim Hornyak on CNET.

Duane Tilden‘s insight:

>The New Century Global Center building opened recently in Chengu, a city of more than 14 million people in southwest China’s Sichuan province. It’s described as “the world’s largest standalone structure” by Chinese officials and is 328 feet high, 1,640 feet long, and 1,312 feet wide.

While Boeing’s plant in Everett, Wash., is the world’s biggest building by volume, the Chinese mall seems to be tops in floor space. Almost the area of Monaco, its 420 acres of floor space could fit nearly three Pentagons, four Vatican Cities, or 20 Sydney Opera Houses.

The cavernous structure will feature a mix of retail outlets, a 14-screen movie theater, a university complex, offices, hotels, a water park called Paradise Island, a skating rink that’s big enough to host international competitions, a pirate ship, 15,000 parking spots, and even a fake Mediterranean village.<

See on news.cnet.com