DIY Underfloor Heating

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By Tim Carter
©1993-2010 Tim Carter

Summary: DIY underfloor heating is a good idea, and it can be a simple project. Discover the best diy underfloor heating system that will allow you to get your job done quickly. But be warned, if you make a few mistakes your time and money might be wasted. In the worst cases, you may endanger your life.

Related Articles: radiant heat

DIY underfloor heating is a popular project, because many people hate walking across cold floors. There is often nothing more comfortable than soothing heat generated by a diy underfloor heating system.

Some diy underfloor heating systems are easy to install, while others require the touch and skill of a professional. The electric diy floor heating mats are very popular, because you simply unroll them, connect them to the electrical system and then cover them with the flooring material. Ceramic tile, granite flooring and any other natural stone product work very well with these electrical diy underfloor heating mats. The reason for this is simple: the underfloor heating mats are very thin.

The hot-water diy heating systems are more of a challenge. To produce enough heat, the diy underfloor heating water systems must have a pipe size with an inner diameter of nearly one-half inch or larger. These larger pipes can't be easily covered with flooring materials, so they often are installed within the concrete slab on under a wood subflooring system.

It is possible to do a diy underfloor heating system on top of a wood subfloor, but the pipes often must be covered with a liquid compound that looks like pudding but sets up and hardens like concrete. This is a very difficult multi-step process and many do-it-yourselfers are not equipped with the tools and skills necessary for a professional installation.

The hot water systems also require boilers or water heaters to generate the heat transferred by the heating pipes under the flooring. It takes great skill to size, install and connect these heating plants to the piping systems.

The biggest mistake a do-it-yourselfer can make while installing radiant heating in a floor is undersizing the system. It is very important to make sure the correct amount of heating is being installed to offset the cold or heat loss. Not all houses need the same amount of heating elements. A floor space that gets colder in the winter will require more Btus than a house in a mild climate. Pay attention to the sizing guides produced by the heating product manufacturers.

Electrical-wiring methods are very important when it comes to diy underfloor heating systems. Many do-it-yourselfers are not qualified electricians, and they can overload circuits if not careful. This grave mistake can cause deadly electrical fires.

An electrical underfloor heating system can draw significant electrical current, and you must make sure the mat is on its own circuit if the instructions or electrical code require it. Adding new electrical circuits is not a hard diy project, but it can be very intimidating.





Comments:

mauro tatini
25 Nov 2008, 17:04
I just bought a fixer-upper upstate NY, and the weather here is no joke in the winter time. The place has an old, broken furnace, half-destroyed ducts, and electric baseboard heating (operating) - of course it's expensive and never quite enough heat. I'm thinking about doing radiating heating throughout the house - I've tried calling professionals to come do the work, but after the 5th no-show in a year, I decided I need to do it myself (people just don't want to work up here, it's crazy!) - anyway, pexsupplies (or something like that) can size up your house and professionally design your system, then sell it to you so you can do it yourself. What are you thoughts on that? (I'm a fast learner and very good with tools, have a huge library of books, and read extensively before engaging into any project - they usually come out great - I've done two bathrooms and lots of other things)
thanks!
DON
21 Nov 2009, 07:38
CAN THIS PRODUCT BE INSTALLED UNDER THE SUB FLOOR BETWEEN FLOOR JOISTS? TILE FLOOR ALREADY INSTALLED OVER WONDER BOARD AND 1" PLYWOOD DECK. I WOULD ATTACH THIS PRODUCT TO BOTTOM OF PLYWOOD BETWEEN FLOOR JOISTS THEN COVER WITH INSTULATION BATTS...WOULD THIS WORK???
Scott
27 Nov 2009, 21:55
You can install between joists. You'll need to drill the joists so you can run a loop in each joist cavity. I pinned the pex tubing to the sides of the joists, then from below put in a layer of reflective blanket insulation to reflect the heat up, then some insulation batts and closed it up. Doesn't take long to warm up, stays toasty.
keith mcbride
28 Dec 2009, 12:49
can i join two under floor heating mats together using just one thermostat,if so how many can you join up, many thanks Keith

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