Do you follow the Mansard Monday hashtag on Instagram? It’s a good one if you are as smitten with Mansard roofs as I am. What’s a Mansard roof? Glad you asked. Even if you don’t recognize the name, I know you’ve seen the style. Remember, I’m a fan girl, not an architect, but here’s my amateur explanation. A Mansard roof is a 4-sided gambrel-style hip roof. Woo! That’s a mouthful. What’s a gambrel? Think of a classic barn roof like that Fisher Price barn toy your kid had growing up. It has two symmetrical sides and each side has two slopes. What about a hip roof? With a hip roof,…