help!decision on insulation time!!

roisincorran

Hi. Im building a house myself direct labour! Yes I am insane... anyway I have got it as far as first fixing and I now need to insulate roof and walls...
Its a 2 storey house. 1200 sq feet in total. Triple glazing windows. Heat recovery system fitted and double block walls with cavity in between. So my plan is to use solid fuel stove with back boiler and solar water heater only to heat house with radiators
ive defo going with 150mm kingspanbacked plasterboard on external walls but I cant decide about the roof insulation...has anyone used the method involving blasting in wet paper?
Is it true if you use rock wool it will sink and need replacing in a few years...
All suggestions or guidance greatly appreciated...

Mamil biker

roisincorran wrote: »

Hi. Im building a house myself direct labour! Yes I am insane... anyway I have got it as far as first fixing and I now need to insulate roof and walls...
Its a 2 storey house. 1200 sq feet in total. Triple glazing windows. Heat recovery system fitted and double block walls with cavity in between. So my plan is to use solid fuel stove with back boiler and solar water heater only to heat house with radiators
ive defo going with 150mm kingspanbacked plasterboard on external walls but I cant decide about the roof insulation...has anyone used the method involving blasting in wet paper?
Is it true if you use rock wool it will sink and need replacing in a few years...
All suggestions or guidance greatly appreciated...

Are you planning on 150mm internally...?
Why not pump the walls.

Mamil biker

roisincorran wrote: »

Hi. Im building a house myself direct labour! Yes I am insane... anyway I have got it as far as first fixing and I now need to insulate roof and walls...
Its a 2 storey house. 1200 sq feet in total. Triple glazing windows. Heat recovery system fitted and double block walls with cavity in between. So my plan is to use solid fuel stove with back boiler and solar water heater only to heat house with radiators
ive defo going with 150mm kingspanbacked plasterboard on external walls but I cant decide about the roof insulation...has anyone used the method involving blasting in wet paper?
Is it true if you use rock wool it will sink and need replacing in a few years...
All suggestions or guidance greatly appreciated...

Are you planning on 150mm internally...?
Why not pump the walls.

roisincorran

Yes internally and I was going to pump the walls too. Its the ceiling thats wreckin me head... im going a bit ott with kingspan internally and pumping walls but I want the house to be super insulated because I wont have any automatic heating system and want to retain as much heat as possible throughout the day for when I return from work. Im presuming that the better insulated the house the quicker it warms up on a cold winter evening after I light the stove...

Mamil biker wrote: »

Are you planning on 150mm internally...?
Why not pump the walls.

MicktheMan

OP,
what does your BER assessor advise?

roisincorran

I dont have a BER assessor.....is that mandatory?
My house was well on its way before new building regs came in so I know for a fact im not concerned with new building regs but do I still need a ber guy???

MicktheMan wrote: »

OP,
what does your BER assessor advise?

sydthebeat

roisincorran wrote: »

I dont have a BER assessor.....is that mandatory?
My house was well on its way before new building regs came in so I know for a fact im not concerned with new building regs but do I still need a ber guy???

Did your building start after 2008?
Because from them onward you need to do a preliminary ber agreement to find out exactly what you need to do to comply with minimum building regulations.

To be honest, from what you've posted so far it's very obvious you have no professional input into the build and it's suffering because of that.

roisincorran

I have a certified engimeer and yes building started before august 2008 so I do t need a prelimenary ber agreement.
I want advice on insulatio from someone who has advice on insulation.

sydthebeat wrote: »

Did your building start after 2008?
Because from them onward you need to do a preliminary ber agreement to find out exactly what you need to do to comply with minimum building regulations.

To be honest, from what you've posted so far it's very obvious you have no professional input into the build and it's suffering because of that.

MicktheMan

roisincorran wrote: »

Yes internally and I was going to pump the walls too..

I would really advise you to reconsider this spec. Do you realise that you are introducing the real risk of damp/mould into you house?

roisincorran wrote: »

1.I dont have a BER assessor.....is that mandatory?
2.My house was well on its way before new building regs came in so I know for a fact im not concerned with new building regs but do I still need a ber guy???

1.Yes, unless you received planning prior to 2007.

2.Building regs are in effect for decades. Who will be certifying the building?

roisincorran

The engineer will be certifying the building. Thats why i have one...
The draftsman who got me my planning permissi9n and drew up the drawings etc will be doing the ber assessment for me im just look8ng for advice on insulation. Whats wrong with my specs? How is kingspan and pumping walls and having a heat rec. Vent system introducing the risk of damp/mould into my house?
quote="MicktheMan;90390847"]I would really advise you to reconsider this spec. Do you realise that you are introducing the real risk of damp/mould into you house?




1.Yes, unless you received planning prior to 2007.

2.Building regs are in effect for decades. Who will be certifying the building?[/quote]

MicktheMan

roisincorran wrote: »

The engineer will be certifying the building. Thats why i have one...
The draftsman who got me my planning permissi9n and drew up the drawings etc will be doing the ber assessment for me im just look8ng for advice on insulation. Whats wrong with my specs? How is kingspan and pumping walls and having a heat rec. Vent system introducing the risk of damp/mould into my house?

I would ask these questions to your engineer (that's why you have one;)). If he/she cannot answer then seek out a professional who can.

roisincorran

The engineer can advise me but at the end of the day I have to decide on everything including insulation so thats why I started this thread♡

I am getting quotes from various insulating companies I was just looking for some personal experiences both positive and negative with various types of insulation. Is that not a good idea and partly the idea behind boards.ie?

MicktheMan wrote: »

I would ask these questions to your engineer (that's why you have one;)). If he/she cannot answer then seek out a professional who can.

BryanF

Roisin
Where internal walls, floor, ceiling joists etc meet the external walls, how will the drylining work?
What will the due point be at the inner block work leaf with the addition of 150 drylining?
Will you be plastering the block walls before drylining to improve air-tightness?
Regarding the roof, what is the depth of joist? have you breathable felt double battened above? or are you leaving a vent gap, maybe a vent card underneath?
If you pump in cellulose or other material will you have a thermal bridge at the joist locations, or did you put insulation over the joists? Have you a vapour barrier specified and air-tight tape/ back boxes for lights etc?

MicktheMan

roisincorran wrote: »

The engineer can advise me

Then I would advise you to take his/her advice.

Look, I'm not being smart but in this day and age, it is no longer good enough to just look at insulation in isolation. Building fabric, insulation, ventilation, moisture control etc need to be considered together in order to end up with a comfortable, affordable and healthy home. These details should ideally be decided before the build starts.

So again, seek the professional advice you need.

4Sticks

roisincorran wrote: »

Is that not a good idea and partly the idea behind boards.ie?

Ah yes the internet. Just wait long enough and you will get the answer you want.