ルックアップ。見下ろして。まず大きな空気漏れをシールします。
今日、ほとんどの住宅所有者は、「漏れやすい」住宅が快適性の問題を引き起こし、エネルギー効率に制限を課すことを理解しています.しかし、この問題に対処する最善の方法は何ですか?
Google の「エネルギー効率の改善」を参照すると、次のことをアドバイスする善意の記事がたくさん見つかります。
- 窓やドアの周りをコーキングする
- 古い窓を交換するか、嵐の窓を追加する
- 古い外装ドアを交換する
- ウェザーストリップを強化
- 外壁のコンセント周りをコーキングする
- 断熱材のR値を高める
等々。これらの改善の多くはおそらくエネルギー効率と快適性を小規模に改善するでしょうが、木のために森を見逃すというより明確なケースはありません.
最大の空気漏れは、窓やドアの周りではありません。
空気が出入りする隙間をふさぎ、家のエンベロープを引き締めたいと決心した場合は、見上げるだけです。それから下を向いてください。これらは、最大のリークがある場所です。
私たちは知っています。あなたはそれらを見ることができません。窓周りの水漏れほど目立たないため、ほとんどの人はそこにあることに気づきません。
それらを見つける方法は次のとおりです。次に屋根裏部屋やクロールスペースに入るときに、すべての電気、配管、およびエアダクトの貫通に注意してください.ほとんどの家には、ワイヤーとパイプがたくさんあります。シーリングファンや埋め込み式照明も大きな問題です。
請負業者がその機器を設置するとき、天井や床にドリルで穴を開けたり、穴を開けたりする必要がありました。 More often than not, they make the holes bigger than they need to be, allowing lots of air to escape.
These are the biggest gaps in your home envelope. They're the ones you should seal first.
In most homes, sealing these leaks saves much more on utility bills and improves comfort over and beyond what you gain from replacing your windows - even if you purchase the newfangled, foam-filled models with low-e glass! It's a little messy because you either have to lift up or temporarily remove attic or crawl space insulation. But it's well worth the trouble.
And the fact that you're eliminating the biggest leaks is only part of the story.
Before sealing leaks, understand the stack effect.
Warm air rises. You knew that, right?
Did you know that it also sinks? That little fact often surprises people, but it's true in some circumstances. The important thing to remember, though, is that air inside a closed system, like your home, travels up and down. We call this phenomenon the "stack effect". The biggest pressure boundaries in your home are at the top and bottom, not the sides.
Here's how it works in winter:Cold, dense air enters from below (air leaks in your crawl space) and pushes warm air upwards, through leaks in your attic.
In the summertime, things work differently. The air outside is warmer; it enters through your attic while cooler, denser air inside your home escapes through leaks in the bottom of the envelope.
What does all of this mean in the context of air sealing? Basically, the relative size of gaps at the top and bottom of the envelope isn't the only reason to seal your attic and crawl space first. The fact that more air enters and escapes from those areas anyway means they should be your top priority when pursuing energy improvements.
When it comes to home performance, here's how to proceed
To confirm whether your attic and crawl space are the biggest sources of air leakage - and they almost always are! - you should really invest in a home assessment from a Building Performance Institute-certified professional. The assessment will also reveal other major air sealing opportunities that are unique to your home.
That being said, following these steps usually results in maximum energy savings and prioritizes the most significant comfort improvements:
- Seal attic and crawl space air leaks: You're addressing the biggest pressure boundaries, and you're probably eliminating the biggest leaks at the same time.
- Increase attic insulation and encapsulate the crawl space: After you've sealed attic air leaks, it might make sense to increase the R-value of your insulation - especially if you've got old batts labeled R-19 or below. If your air handler is in your attic, consider using spray foam insulation to bring all of your indoor HVAC equipment and ductwork into the building envelope. Crawl space encapsulation does the same for your crawl space and offers other benefits as well.
- Caulking and air sealing around windows and doors: Until pretty recently, most window and door installers just stuffed fiberglass around each unit and covered it up with trim. Fiberglass isn't an air barrier, though. To properly seal around windows and doors, you need to remove the trim, yank out the fiberglass, and replace it with low-expansion spray foam.
- Caulking and air sealing other small gaps and cracks: Only worry about electrical outlets and other random wall penetrations after you've dealt with the big stuff.
Notice how "window replacement" didn't make our list? Replacing your windows is expensive and doesn't provide much ROI in terms of energy savings and comfort - at least not when you compare it to sealing your attic and crawl space. The same goes for replacing HVAC equipment. Should you replace it when it's old and worn out?絶対。 But replacing it as a "quick win" for better efficiency and comfort isn't always the best choice.
Instead, seal leaks at the top and bottom of the envelope. You'll probably be amazed at the comfort gains.