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Question DetailsAsked on 2/24/2017

do I need a heat shield for plastered walls from a hot water radiator

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2 Answers


Assuming this is against a wall - yes.

1) Without a reflective shield (preferably bare shiny metal or shiny aluminum paint, high gloss white next best if you insist for aesthetic purposes), you will lose a significant amount of the heat into the wall - basically wasted heat. Heat shield should be spaced at least 1/8" and preferably 1/4" or more from the wall using standoff washers or such - because if it is in contact with or very close to the wall it will convect/conduct heat to the wall. Back side of the shield (the side facing the wall) should be shiny metal (or ideally ultra low-emissivity mirror-like coated) to prevent it from radiating heat to the wall.

2) without the heat shield, the wall will get excessively hot, which can lead to breakdown in the building materials and drywall paper and paint blistering over time, because the radiator (depending on how far down the zone it is located) can potentially reach near 200 degrees.

3) a hot spot in the wall like that (without shield) can also lead to roof melting problems if locatedon top floor - with the heat rising through the wall and into the attic right under the roof, promoting ice damming and glaciering.

4) ideally, there should beone under the radiator too, or an angle on the bottom of the wall one angled out towards the room to reduce overheating of the flooring. Wood flooring can get badly dried out and crack and split, plastic floorings can actually bubble and melt in extreme cases (usually more with steam than hot water heating).

Answered 3 years ago by LCD



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Answered 3 years ago by Member Services

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