The post just before this one is basically how you add pitch make your
first perlin whatever you want to raise the pitch and graduate from there to about a 1 x 4 this is what I done.However if you lay down a layer of fanfold, that is the pink dow-corning styrofoam insulation which is cheap and easy to use because it just lays out as you go
you will eliminate the tinny sound from the roof unless it is hailing golf balls.
Put the fanfold down first as a insulation and noise isolator then
nail the perlins over it.
You will see in my pictures that my pitch is about triple what you have
but it was less prior, only about double yours.
I also added ladder frames on sides of house as mine had no eave,except on ends before
and this solved problems of rotting at window frames and now you can enter house in rain storm without water pouring in your face as you unlock the house,and we can leave windows open in less than driving rain and it don't pour in the sill.
I had the new end caps bent by a roofing place but the peak cap and top ends were available through same place I got the steel.
Steel has 25 or 30 year warranty I suggest best warranty type it is
slightly thicker unless you need the extra flex.
On yours you may want to have someone bend you a transition
piece from the main roof to the add ons so water in that area is
directed off main and onto secondary a little past start point.
You will see I have booted all the vents and stacks with rubber boot stacks that are for this type of steel , they work well as the metal flange around them, you use to screw them down is soft aluminum and you seal under them before screwing down.
All the soffit material was standard ,the only thing I did was use unvented soffit as no need to vent addon soffits.The fanfold and
using white steel has actually made the house cooler in summer.
Before by noon on a 90 degree day in summer it was 90 in here,now by the time inside temp reachs outside ,night is falling.
If you notice the streaking under the roofline on the soffit no this isn't from the roof,there was a field fire behind my house and then it rained the next day and that is the soot washing off the roof.[/img]