遮熱塗装

遮熱系塗料が、ここ最近で注目されています。

東日本大震災による、節電の流れが後押ししていると考えられます。

塗装工事を考えている方だと、選択肢の一つとして考えているかもしれません。

以下遮熱系塗料の仕組みと、その実効性に関して考えていきましょう。

夏場には日光が建物に当たることにより、表面温度が上昇し結果として室内温度も高まります。

ここに屋根に遮熱系塗料を塗っていると、表面温度を通常よりー20度低減することができ、室内の温度上昇を抑制することが出来、その結果冷房費の削減・節電校があるというのが各種塗料メーカーの説明です。

この屋根の表面温度が20度低減するという内容に関しては、各種塗料メーカーが同じ様な説明をしており、検証実験も十分になされているので間違いはなさそうです。

ただ、ここで注意しておきたいことは、最近の住宅の場合には遮熱工法が全体に施されており、屋根・天井からの伝熱は一定程度低減できているということです。

つまり、遮熱系塗料を使おうと、使わまいと外気の室内の影響はさほどないということです。

屋根の温度が20度低減しても室内にはあまり伝わらないのです。

遮熱系塗料が最も効果を発揮するのが、工場や体育館など、室内空間が広く熱の伝わりやすい構造となった建物です。

屋根の面積が住宅と比べると大きく、その分熱が伝わりやすくなっているものです。

こうした建物であれば、屋根遮熱構造に加えて、遮熱系塗料を屋根に施すことでさらなる遮熱効果が見込めます。

一方で、住宅の場合だと建物のグレードが高いものほど、遮熱系塗料は必要ないということになります。

遮熱系塗料は一般の塗料材よりも割高になってしまうのが現状です。

勿論予算的に余裕が有るのなら、無いより有るにこしたことはないでしょうが、遮熱系塗料を選ぶことによって上乗せになる予算を他の塗料材のグレードアップ等に利用して耐久性を高めたりなど有効な手段が他にもあるのではないかと思います。

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