Friday, 13 December, 2019
The DIYer's Combo Deal - Save $9.90
WP_Post Object ( [ID] => 3388 [post_author] => 638 [post_date] => 2018-04-01 17:09:40 [post_date_gmt] => 2018-04-01 07:09:40 [post_content] => Three essential tools for every handyman or woman. Includes our magnetic WristBuddy, an extendable, flexible magnetic flashlight and our three function COB headlamp!

1 - Magnetic WristBuddy:

The magnetic WristBuddy keeps everything within easy reach whether you’re under the hood, squeezing into a bathroom cabinet, up a ladder or just nailing a few 4×2’s together! Designed to hold lots of screws, nails, nuts and washers, the magnets are amply strong enough to also hold drill bits, hex keys, bolts, screwdrivers and even spanners. Made from extremely durable 1680D Oxford cloth, your WristBuddy will be with you for years to come.

2 - Magnetic, Extendable, Flexible Flashlight

  The perfect tool for finding that lost screw that rolled under your workbench or the pins that dropped onto the carpet! This bright, COB LED flashlight extends to a full 60cm (2ft), has a flexible neck and a strong magnet in the lens surround. It's also a wonderful aid for anyone with bad knees.

3 - Three Function COB LED Headlamp

How often have you wished for better lighting while doing a job? All you needed was a third hand with a flashlight, right? This tough, fully adjustable headlamp uses the latest Chip On Board LED technology for maximum performance. Set it for bright, normal or strobe function with a click of the switch. Weighing just 65 grams (2.25 oz), including the three AAA batteries, our headlamp can be worn hour after hour. And because it's both shock and water resistant, it's great for camping and fishing as well as in the home and workshop.

Special offer:

Bought separately, these three items are currently selling for a combined total of $27.40. For this week only, we have packaged all three for just $17.50 including free delivery. Please note that there is a limit of three combo packs per customer. [add_to_cart id="3388"]   [post_title] => The DIYer's Combo Deal [post_excerpt] => Three essential tools for every handyman or woman. Includes our magnetic WristBuddy, an extendable, flexible magnetic flashlight and our high-powered COB headlamp! The perfect gift for any DIYer! Maximum of three combo packs per customer. [post_status] => publish [comment_status] => open [ping_status] => closed [post_password] => [post_name] => the-diyers-combo-deal [to_ping] => [pinged] => [post_modified] => 2019-03-11 00:01:10 [post_modified_gmt] => 2019-03-11 00:01:10 [post_content_filtered] => [post_parent] => 0 [guid] => http://deals.thediy.market/?post_type=product&p=3388 [menu_order] => 0 [post_type] => product [post_mime_type] => [comment_count] => 11 [filter] => raw )
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The Super Insulated House / Passivhaus (Part II)

The Super Insulated House / Passivhaus (Part II)

Last Updated on

Guest Blogger – Leonard Smit

Welcome back to the land of the super-insulated home! Hopefully you’ve read Part 1 where I introduced the key principles of the Passivhaus, including its genesis during the ’70s as the Super Insulated house.  You have? Congratulations for getting this far, because – for a little while here, it gets harder.

In Part 2 we’re going to look a little closer at some of these principles to gain a sense of what they mean in practise, and why they are so important to your hip pocket.

Before doing that, let’s clear up some of the confusing terminology that unnecessarily complicates this topic. This is not an exhaustive list, nor necessarily entirely accurate. You will also see some of my world view creeping in so it’s quite likely that some may object to my interpretations. I can live with it as long as you can :)

Eco, Green, Environmentally Friendly, Sustainable:
These are vague, undefined terms. They can mean nothing or they can mean anything (marketing dream words). In many cases they are used to describe things that are blatantly the antithesis of what a reasonable person would think is meant … a green building in Las Vegas anyone?

I wonder if it's Perrier?
I wonder if it’s Perrier?

Passive Solar:
A building with a heavy design focus on being kept warm by trapping the heat of the sun without using ‘active’ methods (such as fans or pumps). Passive solar designs are often accompanied by the use of prevailing winds for natural ventilation, a focus on thermal mass, lots of sun oriented glass, stack effect ventilation, etc.

Passive Cooling:
Similar to Passive Solar, but focused on keeping the house cool, rather than warm. This is not a particularly well studied area and good information is difficult to find. Passive cooling is very difficult to do successfully, which is perhaps why it’s been a particular area of interest for me.

Zero Energy:
A building that generates the same amount of energy as it consumes. It is not necessarily an indicator of energy efficient design, but the two often go hand-in-hand. Many zero energy buildings are built to the Passivhaus Standard.

Passivhaus:
The Standard created by the Passivhaus Institut, based on a 40 year body of science and engineering.

The Passivhaus Standard includes relevant passive solar and passive cooling design elements such as the heat of the sun, the amount of glazing and its placement, shading, thermal mass, and earth tempered ventilation.

Passive House:
The confusion begins …… some English speaking countries that have adopted the Passivhaus Standard have decided to anglicise ‘Passivhaus’ into ‘Passive House’. But ‘Passive House’ is also quite widely used as the short name for ‘Passive Solar (House)’.

To avoid confusion, I’ll be using the term ‘Passivhaus’ in this article, even though I’m quite fond of ‘super insulated’ because of the richness of its scientific and engineering history.

Thermal Bridges
Tech alert! This section is quite technical. If you prefer to skip it, here is the summary – if you want to build a thermally efficient house (whether Passivhaus or not), and your proposed builder doesn’t know what a thermal bridge is, or tells you they’re not important … find another builder. Seriously. Run. Don’t walk!

OK – still with me? A thermal bridge is exactly what it sounds like it is. Anything that conducts heat reasonably well and is placed in such a way that it connects (or partially connects) the interior of the building to the exterior is a convenient bridge for the heat army to go marching across – pesky little beggars. When it’s cool outdoors the heat leaks out, cooling the interior. When it’s warm outdoors the heat leaks in, warming the interior.

The most common thermal bridges are formed by metal or concrete items – some examples are some types of metal windows, steel items (bolts, nails, wire, brackets, reinforcing, etc.), concrete floors and metal pipes. But even things that we don’t normally think of as conducting heat can form a thermal bridge. So the wood framing of a wood framed building can be a thermal bridge because the wood conducts heat better than the rest of the wall.

Thermal bridging on a timber framed house
Thermal bridging on a timber framed house

Let’s head into the kitchen. Imagine a pea on a plate … now tip the plate slightly to one side; the pea will roll to the lower side. The more steeply the plate is tipped, the faster the pea rolls. The pea is the flow of heat and the angle of the plate is the difference in temperature between the indoors and the outdoors. The bigger the temperature difference between indoors and outdoors, the more heat will flow across a thermal bridge.

Put some gravy on the plate and the pea will roll slower for the same amount of tipping as with no gravy. That’s like a thermal bridge made of something (like wood) that conducts less heat.

So what’s the big deal? Most thermal bridges are such a tiny portion of the structure that they surely can’t have much effect … can they? Anyone remember the bit in Part 1 about physics completely ignoring intuition, perceptions, wishful thinking, politicians, lawyers and optimists? Thermal bridges are a great example. They have an effect vastly disproportionate to their size.

To illustrate, here is an example from our build. It is simplified, but it was a stark lesson in the effect of thermal bridges. The outputs are from a free program named THERM produced by the Lawrence Berkeley National Laboratory in the United States of America. (http://windows.lbl.gov/default.htm).

Continued on Page 2…

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