Insulating base­ment walls

Seaway News - - AUTO TALK -

( NC)— To im­prove en­ergy ef­fi­ciency, Hy­dro-Québec strongly rec­om­mends insulating base­ment walls.

Adding in­su­la­tion to the unin­su­lated, semi-in­su­lated or un­fin­ished walls of a home base­ment can help achieve ther­mal re­sis­tance up to RSI 3.7 and save a lot on heat­ing: up to $ 375 per year for a house with a base­ment that was not in­su­lated.

It is also pos­si­ble to save a great deal on heat­ing by insulating the roof crawlspace.

This ta­ble shows the po­ten­tial sav­ings for a 84m2 wall in­su­lated to RSI 3.7.

* Min­i­mum in­su­la­tion val­ues. The sav­ings cor­re­spond to the dif­fer­ence in in­su­la­tion be­tween this value and the max­i­mum value of RSI 3.7.

Ad­van­tages of insulating base­ment walls

• In­su­la­tion in­creases com­fort by re­duc­ing or elim­i­nat­ing cold drafts in the walls and the feel­ing of be­ing cold in win­ter.

• In­su­la­tion also re­duces con­den­sa­tion on the in­side sur­face of base­ment walls.

In an ex­ist­ing build­ing

• Usu­ally in­su­la­tion is ap­plied from the in­side, us­ing in­su­la­tion that comes in batts or rigid in­su­la­tion board.

• A va­por bar­rier must be in­stalled in­side and rigid in­su­la­tion board must be cov­ered be­cause of its flamma­bil­ity.

For new build­ings

• It is rec­om­mended that base­ments be in­su­lated from the out­side us­ing rigid in­su­la­tion board to pro­tect foun­da­tion walls against the fluc­tu­at­ing ther­mal stresses to which they are ex­posed.


• Be­fore start­ing the work, make sure there is suf­fi­cient earth cov­er­ing the out­side of the foun­da­tions to pro­tect the foot­ings from frost.

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